Intermittent Fasting Knowledge Center

Time-Restricted Eating Helped Women With PCOS Lose More Weight: What the Research Shows

A randomized trial of 93 women with PCOS, published in iScience in 2025, found time-restricted eating plus dieting cut weight by about 7 kilos in 16 weeks.

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Early Time-Restricted Eating Helped Women With PCOS Most: What the Research Shows

A randomized trial of 75 women with PCOS found early time-restricted eating improved blood sugar, insulin, and cholesterol more than midday eating, 2026.

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Time-Restricted Eating Helped Women With PCOS Lose Weight: What the Research Shows

A randomized trial in Nature Medicine tested time-restricted eating in 76 women with PCOS over 6 months, finding weight loss similar to calorie cutting, 2026.

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Christian Orthodox Fasting Raised a Fat-Regulating Hormone in Women: What the Research Shows

A 2022 study of 97 women found Orthodox fasting raised a fat hormone more than time-restricted eating, per International Journal of Food Sciences and Nutrition.

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Time-Restricted Eating for PCOS: What the Research Shows

A randomized crossover trial of 15 women with PCOS found time-restricted eating lowered weight, waist size, and a blood sugar test more than free eating, 2026.

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Fasting Lowered Liver Enzymes in Women With Menopause and Arthritis: What the Research Shows

A Scientific Reports trial of 44 postmenopausal women with rheumatoid arthritis found that 16:8 fasting lowered liver enzymes and oxidative stress in 2025.

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Alternate Day Fasting Works Equally Well Before and After Menopause: What the Research Shows

A 2021 study in Nutrition, Metabolism and Cardiovascular Diseases followed 75 adults on alternate day fasting; weight loss was similar across menopause status.

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Ramadan Fasting Lowered Fat and Cholesterol in Postmenopausal Women: What the Research Shows

A 2023 Medicina study of 62 premenopausal and postmenopausal Saudi women found Ramadan fasting lowered body fat and cholesterol, especially after menopause.

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Time-Restricted Eating Didn't Change Sex Hormones in Menopause: What the Research Shows

A 2023 study in the journal Obesity followed 23 women — premenopausal and postmenopausal — through 8 weeks of time-restricted eating and tracked hormones.

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Ramadan Fasting and Menopause Hormones: What the Research Shows

A 2024 Frontiers in Nutrition study followed 62 healthy Saudi women through Ramadan fasting, finding estrogen shifted differently before and after menopause.

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Time-Restricted Eating Plus Tai Chi Improved Cholesterol in Menopause: What the Research Shows

A randomized trial of 142 postmenopausal women found fasting plus Tai Chi cut cholesterol and improved artery function more than fasting alone, in 2025.

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Fasting Plus Walking Boosted Muscle Strength in Postmenopausal Women: What the Research Shows

A randomized trial in Nutrients (2026) tested time-restricted eating plus walking in 96 postmenopausal women. Grip strength rose most in the combined group.

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Intermittent Fasting and Uric Acid in Menopause: What the Research Shows

A 2026 Nutrients study followed 43 postmenopausal women comparing keto, fasting, and standard diets. Only keto lowered uric acid, a heart risk marker.

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Adding Fasting to Exercise Didn't Improve Brain Function in Menopause: What the Research Shows

A 2025 Frontiers in Public Health trial gave 59 menopausal women exercise, with or without 16:8 fasting, for 12 weeks. Fasting added no extra brain benefit.

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Time-Restricted Eating Cuts Weight the Same in Both Menopause Stages: What the Research Shows

A 2021 Experimental Gerontology study of 32 women with obesity found 8 weeks of time-restricted eating cut weight the same, before or after menopause.

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Intermittent Fasting Improved Fitness in Postmenopausal Women: What the Research Shows

A small trial of 30 postmenopausal women found intermittent fasting plus interval training raised fitness by 10%, published in Nutrients, 2025.

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Time-Restricted Eating Works the Same Before and After Menopause: What the Research Shows

A 2021 study in Experimental Gerontology found time-restricted eating cut weight equally in 32 premenopausal and postmenopausal women with obesity over 8 weeks.

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Time-Restricted Eating Eased Menopause Symptoms More Than Exercise: What the Research Shows

A 2025 trial in Nutrients followed 54 menopausal women. Combining 16:8 eating with exercise cut menopause symptoms more than exercise alone, the study found.

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Combining Fasting With Interval Workouts Helped Women Over 50 Get Fitter, Trial Finds: What the Research Shows

A 2025 Nutrients randomized trial of 30 postmenopausal women found fasting plus interval workouts beat a low-calorie diet for fitness gains over 8 weeks.

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Does Intermittent Fasting Help Menopause Night Sweats?

A 2025 Nutrients trial of 54 menopausal women found 16:8 fasting plus exercise cut overall symptoms more than exercise alone — but not hot flashes or night sweats.

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We Asked 3,108 People How Fasting Changed Their Mood — 84% of Fasters Said Better

In a poll of 3,108 people, 84% of those who fast said fasting plus healthy eating improved their mood; only 5% said it got worse. Full numbers inside.

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We Asked 4,199 People What Actually Worked — 89% Gave the Same Answer

In a poll of 4,199 people, 89% said fasting plus eating well gave them better results than any diet they had tried. Full numbers and what they really mean.

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463 Adults With Type 2 Diabetes Show Lower Depression Scores After Ramadan Fasting: What the Research Shows

463 adults with type 2 diabetes in a 2019 Diabetes Research and Clinical Practice study saw PHQ-9 depression scores drop 3.5 points after Ramadan fasting.

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Time-Restricted Eating and Dry Fasting Blunted Gum Bleeding in a Clinical Trial: What the Research Shows

A 2025 Journal of Clinical Periodontology trial of 66 adults found dry fasting and 16:8 time-restricted eating reduced gum bleeding versus controls (−9.48%), plus lower CRP and HbA1c.

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Seven-Day Water Fasting Pushes Healthy Adults Into Hypoglycemia 66% of the Time by Day 5: What the Research Shows

Journal of Diabetes Science & Technology, 2026: CGM data from 12 adults on a 7-day water fast show hypoglycemic readings jumped from 3% to 66% of the day.

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16:8 Intermittent Fasting Reduced Heartburn Symptoms in a 96-Hour Stanford Study: What the Research Shows

A Stanford pH-monitoring study of 25 GERD patients found 16:8 time-restricted eating cut heartburn and regurgitation scores versus a normal diet, published in J Clin Gastroenterol 2023.

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Intermittent Fasting Slowed Hair Regrowth by 18% in a Small Human Trial: What the Research Shows

A 2024 Cell study of 49 adults found 18:6 time-restricted eating slowed hair regrowth speed by 18% over 10 days — here's what the randomized trial actually found.

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Intermittent Fasting Lowered Anxiety and Changed Amygdala Brain Connectivity in a 50-Day Study: What the Research Shows

A 2025 Alpha Psychiatry study (n=26) found 18-hour daily fasting significantly reduced anxiety scores and shifted amygdala brain connectivity over 50 days.

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Intermittent Fasting Cut Long COVID Symptoms Nearly in Half in a New Randomized Trial: What the Research Shows

A 2025 Scientific Reports randomized crossover trial (n=58) found a 10-week program of intermittent fasting and a no-sugar diet reduced Long COVID symptom scores by 51.8%.

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Prolonged Fasting Reduced Pain Intensity in Chronic Pain Patients, Including Low Back Pain: What the Research Shows

A German clinical study of patients with chronic pain conditions, including chronic low back pain, found that a 7-day supervised fast significantly reduced pain intensity.

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5:2 Intermittent Fasting Improved Menstrual Regularity in 80% of Obese Women With PCOS: What the Research Shows

A 2026 Frontiers in Endocrinology study of 90 obese women with PCOS found a 5:2 fasting diet with meal replacement improved weight, insulin resistance, and menstrual regularity.

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People Who Practice Time-Restricted Eating Report Better Sleep Quality: What the Research Shows

A Nutrients cohort study of Italian adults found people following time-restricted eating had significantly better self-reported sleep quality scores than non-fasters.

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Prolonged Daily Fasting Did Not Worsen Dry Eye Symptoms in a 2025 Study: What the Research Shows

A 2025 Frontiers in Medicine study of 40 patients found prolonged daily religious fasting, even with complete fluid abstinence, did not significantly worsen dry eye measures (p > 0.05).

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Time-Restricted Eating Cut Standing Heart Rate by 11 BPM in POTS Patients: What the Research Shows

A UC San Diego pilot study (n=20, Scientific Reports 2025) found 12 weeks of time-restricted eating reduced standing heart rate and improved quality of life in patients with POTS.

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Early Time-Restricted Eating Beat a Wider Eating Window for Weight Loss in a 14-Week Trial: What the Research Shows

A 90-person randomized trial found early time-restricted eating (8am-2pm) produced more weight loss than a wider eating window, but most other markers didn't differ significantly.

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Ramadan Fasting Raises Urinary Citrate But Doesn't Increase Kidney Stone Risk: What the Research Shows

A 2012 Iran J Kidney Dis study of 57 men found Ramadan intermittent fasting raised urinary citrate without increasing kidney stone-forming risk markers.

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A Monthly 5-Day Fasting-Mimicking Diet Nearly Doubled Remission Rates in Crohn's Disease: What the Research Shows

A 2026 Stanford randomized trial found a 5-day fasting-mimicking diet, repeated monthly for 3 months, drove clinical remission in 64.6% of Crohn's patients vs 37.5% on standard diet.

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Two-Day Fasting Cycles Lowered Iron and Hemoglobin in Healthy Women: What the Research Shows

A controlled trial of 46 women found that repeated 2-day fasting cycles significantly lowered iron, ferritin, and hemoglobin — here's what the 2014 study found.

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Varicose Veins Raise Blood Clot Risk During Prolonged Ramadan Fasting: What the Research Shows

A 311-person observational study found new blood clots in 4.8% of Ramadan fasters, with varicose veins and venous reflux among the strongest predictors, Cureus 2025.

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Longer Overnight Fasting Was Linked to Higher Gallstone Hospitalization Risk in Women: What the Research Shows

A prospective cohort of 4,730 women found gallstone hospitalization risk rose with longer overnight fasting periods and with dieting, per a 1991 American Journal of Public Health study.

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16:8 Time-Restricted Eating Improved Lung Function (FEV1) in Overweight Women: What the Research Shows

A 2024 Nutrients trial of 31 overweight/obese women found 12 weeks of 16:8 time-restricted eating significantly improved FEV1 lung function and balance.

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Time-Restricted Eating Produced Weight Loss but Not Better Sleep in Adults With Obesity: What the Research Shows

A 2022 randomized trial in Nutrition and Health found 4-hour and 6-hour time-restricted feeding caused meaningful weight loss but did not significantly improve sleep quality or obstructive sleep apnea risk.

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Fasting-Mimicking Diet Shows Encouraging Trends for Male Fertility: What the Research Shows

A 2025 pilot RCT in Frontiers in Nutrition tested a fasting-mimicking diet in men with impaired sperm quality, finding positive trends in sperm parameters over 6 months.

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16:6 Time-Restricted Eating Lowered a Key Inflammation Marker in Women With Obesity: What the Research Shows

A 2025 quasi-experimental trial in 23 women with obesity found 18:6 time-restricted eating significantly reduced IFN-γ (p=0.025), while IL-10 stayed unchanged.

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Time-Restricted Eating Is Feasible in Polycystic Kidney Disease, But Weight Loss — Not the Fasting Window Itself — Tracked With Kidney Volume: What the Research Shows

A 12-month RCT (n=29) in Clinical Kidney Journal found 8-hour time-restricted eating was as effective as standard healthy-eating advice for weight loss in ADPKD patients (2025).

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Alternate-Day Fasting Improved Premenstrual Mood and Quality of Life in Overweight Women: What the Research Shows

A randomized trial of 60 overweight women found alternate-day modified fasting reduced anger and mood swings and improved quality of life more than daily calorie restriction.

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Intermittent Fasting Linked to Higher Disordered Eating Risk in Young Adults: What the Research Shows

A national cohort study of 2,762 Canadian adolescents and young adults found intermittent fasting associated with higher rates of disordered eating behaviors, 2022.

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Intermittent Fasting Doesn't Disrupt Your Melatonin Rhythm — If Sleep and Light Stay Controlled: What the Research Shows

A controlled 2017 pilot study of 8 healthy adults found intermittent fasting had no significant effect on the circadian melatonin rhythm once meals, light, and sleep were controlled.

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Intermittent Fasting Lowered Oxidative Stress and Liver Enzymes in Women With Rheumatoid Arthritis: What the Research Shows

A randomized trial of 44 postmenopausal women with rheumatoid arthritis found 16:8 intermittent fasting significantly reduced oxidative stress markers and liver enzymes (2025).

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A Small Pilot Trial Tested Fasting Plus Guided Imagery for Chronic Knee Pain: What the Research Shows

A 2021 Nutrients pilot randomized trial tested intermittent fasting and glucose administration paired with relaxation and guided imagery in 32 adults with chronic knee pain.

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A Weekly Fasting Day Plus App Support Beat a Control Diet by 1.6kg: What the Research Shows

A pilot randomized trial in JMIR mHealth and uHealth found a brief, app-supported weekly intermittent fasting program produced significantly greater weight loss than usual care in 57 adults.

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Early Time-Restricted Eating Beats Later Eating for Fat Loss Without Costing Muscle: What the Research Shows

A 2025 Nutrients randomized trial (n=24) found early time-restricted eating (8am–2pm) cut more body weight than a later window while preserving muscle and strength gains equally.

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Alternate-Day Fasting Improves Molecular Aging Markers in Healthy Adults: What the Research Shows

A randomized controlled trial in Cell Metabolism found 4 weeks of alternate-day fasting improved fat mass, cholesterol, and aging-related blood markers in healthy, non-obese adults.

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Three Fasting-Mimicking Diet Cycles Cut Biological Age by 2.5 Years: What the Research Shows

A randomized trial in 184 adults (Nature Communications, 2024) found 3 monthly fasting-mimicking diet cycles lowered biological age by 2.

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Short-Term Water-Only Fasting Raises Uric Acid While Improving Cholesterol and Weight: What the Research Shows

Randomized crossover trial on short-term water-only fasting found improved HDL, weight, and growth hormone alongside a transient rise in uric acid

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8-Hour Time-Restricted Eating Improved Insulin and Hormone Levels in Women With PCOS: What the Research Shows

A Journal of Translational Medicine study found 5 weeks of 8-hour time-restricted eating lowered insulin resistance, androgens, and AMH in women with anovulatory PCOS.

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An Intermittent Fasting Diet Shifted Gut Bacteria and Improved Quality of Life in MS Patients: What the Research Shows

A Cell Metabolism pilot study of 17 people with multiple sclerosis found a 15-day intermittent fasting diet altered gut bacteria and improved quality-of-life scores (2018).

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Fasting Reduced Overactive Immune Cells and Eased Rheumatoid Arthritis Symptoms: What the Research Shows

A 1990 Annals of the Rheumatic Diseases pilot study (n=16) found a 7-10 day fast eased rheumatoid arthritis activity and calmed overactive neutrophils.

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Fasting Mimicking Diet Improves Weight, Waist Size, and Blood Pressure in Prostate Cancer Patients: What the Research Shows

A 2022 pilot study of 29 prostate cancer patients found 3 monthly cycles of a 4-day fasting mimicking diet cut weight by 3.79 kg and blood pressure by 9.5 mmHg.

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Ramadan Time-Restricted Fasting Cut Psoriasis Severity Scores in 108 Patients: What the Research Shows

A 2019 Nutrients study followed 108 moderate-to-severe psoriasis patients through Ramadan and found a significant drop in PASI severity scores after month-long daily fasting.

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Alternate-Day Fasting Doesn't Worsen Thyroid Function in Subclinical Hypothyroidism: What the Research Shows

A randomized secondary analysis found alternate-day fasting produced 7% weight loss and better insulin sensitivity than calorie restriction, without disrupting TSH or free T4 (2020).

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A 5-Day Fast Before a Heart-Healthy Diet Improved Blood Pressure and Gut Bacteria: What the Research Shows

A randomized trial of 71 people found a 5-day fast before starting the DASH diet led to greater blood pressure and gut microbiome improvements than diet alone.

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Time-Restricted Eating Cut IBS Symptom Scores by 100 Points in 8 Weeks: What the Research Shows

A Nutrients pilot study of 134 IBS patients found 16:8 time-restricted eating reduced symptom severity scores by over 100 points in 8 weeks (2026).

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Alternate Day Fasting Raises Growth Hormone and Cuts Insulin by Over Half: What the Research Shows

22-day AJCN trial (n=16) found alternate day fasting significantly raised growth hormone, cut fasting insulin roughly 57%, and preserved lean mass in nonobese adults.

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A 24-Hour Fast Shifts Cortisol and DHEA Rhythms in Obese Adults: What the Research Shows

Frontiers in Nutrition study (2023, n=49) found a one-day water-only fast shifted cortisol and DHEA daily rhythms in obese adults, with effects varying by chronotype.

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Ramadan-Style Time-Restricted Eating Modestly Reduced Dietary Calcium Intake: What the Research Shows

A prospective study of 61 adults found dietary calcium intake fell around 20% during Ramadan time-restricted eating, while vitamin D intake stayed stable.

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An 8-Hour Eating Window Cut Calorie Intake by 341 a Day Without Counting: What the Research Shows

A 12-week pilot RCT (n=23) found 8-hour time-restricted eating cut daily calorie intake by ~341 kcal and body weight by 2.6% without calorie counting.

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Ramadan Fasting Did Not Harm Bone Markers in Healthy Men: What the Research Shows

A prospective cohort study of healthy Saudi men found Ramadan intermittent fasting lowered PTH but left core bone metabolism markers stable across a month of daily fasting.

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One Week of Fasting Eased Rheumatoid Arthritis Symptoms Faster Than Diet Alone: What the Research Shows

Randomized trial in Frontiers in Nutrition (2022, n=53) found a 7-day fast eased rheumatoid arthritis disability scores faster than a standard anti-inflammatory diet.

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Adding Intermittent Fasting to Methotrexate Nearly Doubles Psoriasis Remission: What the Research Shows

A 120-patient randomized trial found 16:8 intermittent fasting alongside methotrexate improved long-term PASI50 remission in plaque psoriasis, 2025 study finds.

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Intermittent Fasting Temporarily Lowers Gut Butyrate, Then Diversity Rebounds: What the Research Shows

A 2023 pilot study of 20 Ramadan fasters found short-chain fatty acids like butyrate dipped during fasting, then gut microbial diversity increased afterward.

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Ramadan Fasting Increased a Key Gut-Lining Bacteria by the End of the Month: What the Research Shows

A 2019 Turkish Journal of Gastroenterology pilot study found Ramadan fasting significantly increased Akkermansia muciniphila, a bacterium linked to gut barrier health, in 15 volunteers.

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Ramadan Intermittent Fasting Did Not Worsen Lupus Disease Activity in a Small Iranian Pilot Study: What the Research Shows

A 2015 Rheumatology International pilot study (n=40 quiescent SLE patients) found Ramadan intermittent fasting did not significantly change SLEDAI disease activity or quality of life scores.

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Time-Restricted Eating Didn't Change IGF-1, But Bigger Weight Loss Did Shift Cancer-Linked Biomarkers: What the Research Shows

A 2024 Nutrients exploratory RCT analysis found 8 weeks of time-restricted eating didn't change IGF-1 overall, but IGFBP2 and leptin improved in participants who lost more weight.

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Alternate-Day Fasting Cut Leptin by 40% in 12 Weeks: What the Research Shows

A randomized controlled trial of 32 adults found alternate-day fasting lowered leptin by 40% and raised adiponectin by 6% in 12 weeks, per Nutrition Journal 2013.

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12-Day Supervised Fasting Reshapes the Body's Omega-3 to Omega-6 Fatty Acid Balance: What the Research Shows

A 2025 European Journal of Clinical Investigation study of 98 fasters found that ~12-day supervised fasting significantly remodeled omega-3 and omega-6 fatty acid levels in red blood cell membranes.

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24-Hour Fasting Raises Reverse T3 and Lowers Active Thyroid Hormone: What the Research Shows

An NIH crossover study of 58 healthy adults found a 24-hour fast shifted thyroid hormone conversion, lowering free T3 and raising reverse T3 (Thyroid, 2019).

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14-Day Medically Supervised Fasting Cut Small, Dense LDL by 30%: What the Research Shows

A 2021 European Journal of Nutrition study of 40 adults found a 14-day supervised fast reduced the most atherogenic LDL subfraction by 30%, while apoB and Lp(a) stayed unchanged.

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How Fasting and Refeeding Cycles Reset Your Immune Cells: What the Research Shows

A Cell study with a human validation cohort found that fasting-refeeding cycles regulate circulating monocyte levels, and that this reset breaks down with age

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Intermittent Fasting Cuts Gum Bleeding and Inflammation in a 97-Person Trial: What the Research Shows

A 97-person Karolinska trial found 6 months of 5:2 intermittent fasting cut gum bleeding, CRP, and HbA1c, though the oral microbiome itself stayed largely unchanged.

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20 Hours of Daily Fasting Improved Insulin Action in Lean Men Without Weight Loss: What the Research Shows

A controlled trial found 15 days of 20-hour daily fasting improved peripheral insulin sensitivity in healthy men, measured by gold-standard clamp testing, with no change in body weight.

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Time-Restricted Eating Improved Blood Pressure and Insulin Sensitivity Without Harming Liver Enzymes: What the Research Shows

A randomized trial of 60 overweight young adults found 6-hour time-restricted eating improved blood pressure and insulin sensitivity while liver enzymes stayed safely stable.

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Fasting Nearly Doubled Migraine Attacks in a Ramadan Study: What the Research Shows

A prospective study of 76 migraine patients found fasting during Ramadan significantly increased attack frequency and severity compared to non-fasting migraineurs.

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Time-Restricted Eating Improved Kidney Function in a Small CKD Pilot Study: What the Research Shows

A 2023 Frontiers in Endocrinology pilot study of 27 adults with CKD stages 3-4 found time-restricted eating raised eGFR versus a decline on a standard diet.

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8-Hour Time-Restricted Eating and Liver Enzymes in Adults With Obesity: What the Research Shows

A 2018 pilot trial of 23 adults with obesity found 8-hour time-restricted eating cut daily energy intake by ~341 kcal and body weight by 2.6% over 12 weeks.

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Three Insulin-Dependent Type 2 Diabetes Patients Stopped Insulin Using Intermittent Fasting: What the Research Shows

A 2018 BMJ Case Reports case series describes 3 long-term insulin-dependent type 2 diabetes patients who discontinued insulin therapy using therapeutic intermittent fasting.

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Ramadan Fasting Reduced Acne Severity and Inflammatory Markers in a 40-Patient Study: What the Research Shows

A 2024 Archives of Dermatological Research study of 40 acne patients found GAGS severity scores, IL-17, IFN-γ, and oxidative stress markers all fell after Ramadan fasting.

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Ramadan Fasting Slowed Post-Match Muscle Recovery in Elite Soccer Players: What the Research Shows

A Frontiers in Physiology pilot study of 8 elite soccer players found Ramadan fasting raised creatine kinase and slowed recovery after a simulated match.

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Periodic Fasting Doesn't Worsen Nerve Function in Type 2 Diabetes: What the Research Shows

A randomized trial in Frontiers in Endocrinology followed 31 adults with type 2 diabetes for 6 months and found periodic fasting left nerve function unchanged.

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Does Fasting Raise Your Blood Clotting Risk? What an Early Ramadan Fasting Study Found

A pre-post study of Ramadan fasting and blood clotting markers found no evidence that fasting raised thrombosis risk in healthy adults — here's what the data showed.

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Time-Limited Eating Was Feasible and Safe for Teens With Obesity in a 12-Week Trial: What the Research Shows

A 2021 pilot RCT of 50 adolescents found 8-hour time-limited eating was feasible, safe, and well-tolerated, with BMI improvements similar to a 12-hour control window.

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Ramadan Fasting Changes Sleep Architecture and Increases Daytime Sleepiness: What the Research Shows

A polysomnography study found Ramadan intermittent fasting altered REM sleep and increased daytime sleepiness on the multiple sleep latency test, per 2001 research.

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16-Hour Daily Fasting Cut Liver Fat More Than Standard Care in NAFLD Patients: What the Research Shows

Randomized crossover trial (n=32) found 16:8 time-restricted fasting reduced liver fat and stiffness significantly more than standard care in NAFLD, 2023.

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Does Intermittent Fasting Deplete Iron, Zinc, and Vitamin D? What the Research Shows

A review of religious and intermittent fasting research finds mixed effects on iron, zinc, magnesium, and vitamin D status — here's what the evidence says.

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A 3-Day Fast Raised Resting Metabolism by 14%, Not Lowered It: What the Research Shows

A landmark study measured resting energy expenditure by indirect calorimetry during a 72-hour fast in 9 adults and found metabolism rose, not fell

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Ramadan Fasting Lowers Insulin and Improves Insulin Sensitivity in Healthy Men: What the Research Shows

A 2021 American Journal of Lifestyle Medicine study (n=27 healthy men) found Ramadan fasting cut insulin and HOMA-IR, improving insulin sensitivity.

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Early Time-Restricted Eating Improved Glucose Control in a CGM Crossover Trial: What the Research Shows

A randomized crossover trial using continuous glucose monitors found early time-restricted eating improved glycemic variability in men with overweight, 2020 study.

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336 Adults Show Lower Depression and Anxiety Scores After 4 Weeks of Dawn-to-Dusk Fasting: What the Research Shows

A 2026 prospective cohort of 336 adults found PHQ-9 depression and GAD-7 anxiety scores both dropped significantly after four weeks of dawn-to-dusk intermittent fasting.

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Ramadan Fasting Doesn't Worsen Asthma in 120 Patients: What the Research Shows

A 2022 cohort study of 120 asthma patients found Ramadan fasting did not significantly change FEV1, FVC, or asthma severity — and may be safe for stable asthma.

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Intermittent Restriction Beats Continuous Dieting for Insulin Sensitivity in Overweight Women: What the Research Shows

A 107-woman RCT published in International Journal of Obesity (2011) found 5:2-style fasting matched continuous dieting for weight loss but produced greater improvements in insulin resistance.

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Intermittent Fasting Significantly Reduces Blood Sugar, Insulin, and BMI: What a 12-Study Meta-Analysis Found

A 2019 meta-analysis of 12 RCTs (870 participants) found intermittent fasting significantly reduced fasting glucose, HbA1c, fasting insulin, and BMI versus controls.

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Intermittent Fasting and Ovarian Reserve in Women: What the Research Shows on AMH and Reproductive Hormone Safety

A 2022 Nutrients review of 14 human trials found intermittent fasting does not disrupt reproductive hormones in healthy women and may benefit women with PCOS.

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Calorie Restriction, SIRT1, PGC-1α Mitochondrial Biogenesis

A randomized trial with real muscle biopsies found 6 months of calorie restriction raised PGC-1α, SIRT1 and mtDNA — the markers of new mitochondria being built.

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Alternate Day Fasting Cuts LDL by 25% and Triglycerides by 32% in 8 Weeks: What the Research Shows

A randomized trial in Am J Clin Nutr (n=16) found alternate day modified fasting reduced LDL cholesterol 25%, triglycerides 32%, and systolic blood pressure over 8 weeks.

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Intermittent Fasting Improved Cognitive Function in Older Adults with Mild Cognitive Impairment Over 3 Years: What the Research Shows

A 3-year RCT in Nutrients (2020, n=99) found 5:2 intermittent fasting significantly improved cognitive scores and reduced oxidative stress in older adults with MCI.

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Ramadan Fasting Cut Psoriasis Severity 24% in 29 Days

A 2022 prospective study in Nutrients (n=41) found that 29-day Ramadan fasting reduced PASI scores by 24% and lowered TNF-α in stable plaque psoriasis patients.

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Prolonged Fasting Protected White Blood Cells and Reduced Side Effects in a Human Pilot Study: What the Research Shows

A 2009 Aging pilot study with 10 cancer patients showed that fasting 24–140 hours protected white blood cells and significantly reduced side effects, with no adverse fasting events.

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Eating Later Relative to Your Body Clock Independently Predicts Higher Body Fat: What the Research Shows

A 2017 Current Biology study (n=110) found meal timing relative to personal melatonin onset predicted body fat independently of total calorie intake, sleep, and activity.

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Daytime Eating Prevents Glucose Intolerance in Shift Workers: What the Research Shows

A 2021 Science Advances randomized crossover trial (n=12) found that restricting eating to daytime hours prevented the glucose intolerance caused by simulated night shift work.

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Alternate Day Fasting Combined with Exercise Reduced Body Fat More Than Either Approach Alone While Preserving Muscle: What the Research Shows

A 12-week randomized trial in Obesity (2013) of 64 obese adults found combining alternate day fasting with aerobic exercise preserved lean mass while cutting fat by up to 6 kg.

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Adverse Metabolic and Cardiovascular Consequences of Circadian Misalignment: What the PNAS 2009 Study Found in 10 Adults

Scheer, Hilton, Mantzoros and Shea put 10 healthy adults through a 10-day simulated night shift in a controlled lab. Glucose tolerance fell, mean arterial pressure rose about 3 to 4 mmHg, and the daily leptin rhythm flattened — all within days, and none of it explained by food or sleep length. Here is the PNAS 2009 study in plain English, and what it means if you eat at night.

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Most Adults Eat Across 15 Hours a Day — and a 10-Hour Eating Window Changed Everything: What the Research Shows

A 2015 Cell Metabolism study tracked 156 adults and found most ate for 15+ hours daily. A 10-hour TRE window reduced weight 3.7% in 16 weeks without calorie counting.

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Alternate Day Fasting Combined With Exercise Preserves Lean Mass While Losing Fat: What the Research Shows

An 8-week RCT (n=64) found combining alternate day fasting with aerobic exercise reduced fat mass by 3kg while fully preserving lean body mass

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Ramadan Fasting Reduces Blood Pressure, Cholesterol, and Blood Sugar: What the Research Shows

A prospective study of 82 adults found Ramadan fasting significantly reduced blood pressure, LDL cholesterol, triglycerides, and fasting glucose over one month.

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Periodic Fasting Linked to 61% Lower Risk of COVID-19 Hospitalization or Death: What the Research Shows

A 2022 BMJ Nutrition cohort of 205 patients found periodic fasters had 11.0% vs 28.8% COVID-19 hospitalization or mortality rate (HR 0.61, p=0.

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Early Eating Window Cut Appetite and Raised Fat Burning

A 2019 crossover RCT in Obesity (n=11 men) found eTRE significantly cut daily appetite and boosted fat oxidation while leaving total energy expenditure unchanged.

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OMAD Does Not Suppress Resting Metabolic Rate: What the Research Shows

A randomized crossover trial in AJCN (2007, n=15) found that eating one meal per day reduced body fat without lowering resting metabolic rate or lean mass.

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Early Time-Restricted Eating Improves 24-Hour Glucose Control Without Calorie Cutting: What the Research Shows

A 2019 randomized crossover trial of 15 men used CGM to show early TRE (9h window, 8am–5pm) significantly reduced 24-hour mean glucose without restricting calories.

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Alternate-Day Calorie Restriction Reduces Oxidative Stress and Inflammation in Humans: What the Research Shows

A landmark 8-week pilot study in Free Radical Biology and Medicine found that alternate-day calorie restriction reduced oxidative stress markers, inflammation, and improved asthma in overweight adults.

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Alternate Day Fasting Shifts LDL to Safer, Larger Particles — Even Without Calorie Counting: What the Research Shows

British Journal of Nutrition pilot study, n=16 obese adults, 8 weeks alternate day fasting: LDL-C fell 25%, triglycerides 32%, and LDL particles shifted to larger, less atherogenic size.

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Eating Protein and Vegetables Before Carbs Cut Blood Sugar Spikes by 37%: The Food Order Study

A 2015 Diabetes Care study found that eating protein and vegetables before carbohydrates reduced post-meal glucose by up to 37% and lowered insulin in adults with type 2 diabetes.

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Alternate-Day Fasting Shifts Fuel Burning Toward Fat Without Slowing Metabolism: What the Research Shows

Lean mass preserved, fat oxidation spiked, and metabolism held steady during 22 days of alternate-day fasting in 16 nonobese adults. Obesity Research, 2005.

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Alternate Day Fasting Raises Adiponectin by 29% and Reduces Leptin in Normal-Weight Adults: What the Research Shows

12-week Obesity journal RCT (n=16) found alternate day fasting raised adiponectin 29%, cut leptin 40%, reduced LDL 25% and triglycerides 31% in normal-weight adults.

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Fasting Mimicking Diet Reduces MS Symptoms and Promotes Remyelination: What the Research Shows

A 2016 Cell Reports pilot RCT (n=60 RRMS patients) found a 3-day monthly FMD improved quality of life and triggered immune cell renewal

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16:8 Fasting Reduces Body Fat and Visceral Fat in Older Men — While Preserving Muscle Mass: What the Research Shows

16:8 fasting for 6 weeks cut body weight 1.92 kg and visceral fat 0.64 L in overweight men aged 65–74 while fully preserving skeletal muscle (Scientific Reports, 2022).

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TREAT Trial (JAMA 2020): Did 16:8 Fasting Cost Muscle?

The TREAT randomized trial (JAMA Internal Medicine 2020) put 116 adults on 16:8 for 12 weeks. They lost no more weight than normal eaters — but lost twice as much lean mass.

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Eating the Same Calories at Breakfast vs Dinner Produces 2.4 Times More Weight Loss: What the Research Shows

RCT of 93 overweight women eating 1,400 kcal showed big breakfast vs big dinner led to 8.7 vs 3.6 kg weight loss and a 33% triglyceride drop in 12 weeks (Obesity, 2013).

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Fasting Halved Joint Tenderness in Rheumatoid Arthritis Patients: What the Research Shows

A Lancet RCT (n=53) found that a 7–10 day fast followed by a vegetarian diet significantly improved all objective RA disease measures.

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Early Time-Restricted Eating Improves Blood Sugar and Resets Circadian Clock Genes: What the Research Shows

A randomized crossover trial in Cell Metabolism (2019, n=11) found a 5-hour early eating window lowered 24h glucose, reduced oxidative stress, and upregulated autophagy and clock gene markers.

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Fasting Under 13 Hours a Night: 36% Higher Cancer Recurrence

A 2016 JAMA Oncology prospective study of 2,413 breast cancer survivors found nightly fasting under 13 hours raised recurrence risk 36% and elevated HbA1c.

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16:8 Intermittent Fasting Significantly Improves Quality of Life and Reduces Fatigue: What the Research Shows

A 3-month prospective trial (n=30, Nutrients 2022) found 16:8 fasting significantly reduced fatigue (FAS p=0.002) and improved quality of life in healthy adults.

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Intermittent Fasting vs Calorie Restriction Over 12 Months: What the Research Shows

A Norwegian 12-month RCT (n=112) compared 5:2 intermittent fasting to continuous calorie restriction. Both produced similar weight loss — and similar adherence rates.

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Nightly 14-Hour Fasting Improves Sleep in Adults with Memory Decline and Obesity: What the Research Shows

A 2024 randomized pilot trial (n=58) found 14-hour nightly fasting significantly improved sleep quality vs health education in adults with memory decline and obesity.

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Fasting Mimicking Diet Improves Skin Hydration and Prevents Skin Roughening in Women: What the Research Shows

A 2023 RCT in 45 women showed 3 monthly cycles of a 5-day fasting mimicking diet significantly improved skin hydration and maintained skin texture vs. controls.

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Fasting Plus Weight Training: Fat Down, Muscle Kept

A 2021 meta-analysis of 6 RCTs (n=149) in J Strength Cond Res found IF combined with resistance training significantly reduces fat mass while preserving lean mass.

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Ramadan Fasting Reduces Inflammatory Cytokines by Up to 78% in Healthy Adults: What the Research Shows

A 50-person prospective study in Nutrition Research (2012) found Ramadan fasting slashed IL-1β by 78%, IL-6 by 57%, and TNF-α by 66% in healthy volunteers.

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Ramadan Fasting Increases Beneficial Gut Bacteria by Up to 73% in 30 Days: What the Research Shows

A 2021 AJCN study of 37 adults found 30 days of Ramadan intermittent fasting increased Lachnospiraceae by 61% and Ruminococcaceae by 73%

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16:8 Time-Restricted Feeding Cut Crohn's Disease Activity by 40% in 12 Weeks: What the Research Shows

In a 2026 Gastroenterology trial, 35 adults with Crohn's disease ate inside an 8-hour window for 12 weeks. Their symptoms dropped by about 40% and their inflammation fell by about half.

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5:2 Intermittent Fasting Reduces Liver Fat, ALT, and Inflammation in NAFLD: What the Research Shows

A 12-week RCT in 44 NAFLD patients found 5:2 fasting cut liver steatosis (CAP −23 dB/m), ALT by 31%, and triglycerides by 25% vs control. Frontiers in Nutrition, 2022.

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Can 3 Cycles of a Fasting-Mimicking Diet Cut Body Fat?

A 2017 randomized trial in 100 adults found three monthly fasting-mimicking cycles lowered IGF-1, body fat and blood pressure while lean mass was preserved.

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4- or 6-Hour Eating Window: Weight Down, No Calorie Counting

A 2020 Cell Metabolism RCT (n=58, 10 weeks) found that eating in a 4- or 6-hour daily window significantly reduced body weight, fat mass, and insulin resistance in adults with obesity — without calorie counting.

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Intermittent Fasting Increases Telomere Length in Young Women: What the Research Shows

A 2024 RCT in Biomedicines (n=29) found Ramadan intermittent fasting combined with exercise significantly increased telomere length and reduced TNF-α vs exercise alone.

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When You Eat Changes Your Stress Hormones: What the Research Shows

A 2021 Nutrients systematic review of 14 studies found that the timing of your eating window — not just fasting itself

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Time-Restricted Eating Improved Thyroid Function in Metabolic Syndrome: What the Research Shows

A 2024 randomized trial (n=162) found 8-hour TRE improved T4 levels and the T3/T4 ratio in adults with metabolic syndrome over 3 months. BMC Medicine.

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Fasting Increases Growth Hormone Secretion Up to 5-Fold in Men: What the Research Shows

A landmark Journal of Clinical Investigation study in 9 healthy men showed a 5-day fast amplified GH pulse frequency and amplitude up to 5-fold while IGF-1 fell.

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Fasting Improves Mood, Sleep, and Well-Being in 1,422 People: What the Research Shows

A 2019 prospective study of 1,422 adults found supervised Buchinger fasting consistently improved mood, sleep, and overall well-being — even across 4–21 day fasts.

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16:8 Time-Restricted Eating Reduces Testosterone by 17% in Men — But Muscle Is Preserved: What the Research Shows

A 12-month RCT in Moro et al. (2021) found TRE reduced testosterone ~17% in resistance-trained men but preserved muscle and dramatically improved inflammatory markers.

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Fasting Reduces Anxiety and Depressive Symptoms Without Increasing Fatigue: What the Research Shows

A 2021 meta-analysis of 11 studies and 1,436 participants found fasting significantly reduced anxiety and depression vs. controls, with no increase in fatigue.

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Intermittent Fasting Preserves Muscle Gains During Resistance Training: What the Research Shows

A 2019 randomized trial in AJCN (n=40) found time-restricted feeding preserved fat-free mass and strength gains in resistance-trained females while reducing fat mass.

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Time-Restricted Eating Does Not Reduce Bone Density in Seven Trials: What the Research Shows

A 2024 Nutrients meta-analysis of 7 RCTs and 313 adults found TRE produced significant weight loss without reducing bone mineral density (MD −0.009 g/cm², p=0.328).

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Alternate-Day Fasting vs Calorie Cutting: The LDL Surprise

A 100-person JAMA Internal Medicine RCT compared alternate-day fasting vs. calorie restriction for 6 months. Both worked — but an LDL finding surprised researchers.

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Intermittent Fasting Produces Similar Weight Loss to Daily Calorie Restriction: What the Research Shows

A 2018 meta-analysis of 11 RCTs (601 participants, 8–24 weeks) found intermittent fasting produces equivalent weight loss to continuous calorie restriction, with a key insulin advantage.

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Does Time-Restricted Eating Improve Sleep? What 6 Randomized Trials Show

A 2024 systematic review of 6 RCTs in Frontiers in Nutrition found mixed results: TRE rarely worsens sleep, but significant improvements are also uncommon.

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Prolonged Fasting Forces the Body to Rebuild Its Immune System: What the Research Shows

A 2014 Cell Stem Cell study (n=11 cancer patients) found that 72-hour fasting triggers immune system regeneration via hematopoietic stem cell activation.

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Monthly 5-Day Fasting Diet Reduces IGF-1, Body Weight, and Inflammation: What the Research Shows

A 2015 Cell Metabolism pilot RCT (n=38) found that a monthly 5-day fasting-mimicking diet reduced IGF-1 by 13%, waist circumference, blood pressure, and CRP in 3 months.

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5-Day Fasting Reshapes the Gut Microbiome and Reduces Blood Pressure: What the Research Shows

A 2021 Nature Communications study (n=71) found that a 5-day fasting protocol changed gut bacteria composition, reduced blood pressure, and improved metabolic markers in metabolic syndrome patients.

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Alternate Day Fasting Increases Autophagy and Improves Aging Markers in Healthy Adults: What the Research Shows

A 2019 Cell Metabolism RCT (n=60) found alternate day fasting measurably increased autophagy markers and improved cardiovascular aging biomarkers in healthy non-obese adults.

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Intermittent Fasting Reduces Insulin Resistance and Improves Hormone Profiles in Women with PCOS: What the Research Shows

A 2025 meta-analysis in Nutrients (PMID 40806019) found IF significantly reduced HOMA-IR by 0.94, lowered insulin 3.17 μU/mL, and raised SHBG in women with PCOS.

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Does Time-Restricted Eating Change Women’s Hormones? No

A 12-month randomized trial (n=90) found 8-hour TRE produced significant weight loss but left sex hormone levels unchanged in premenopausal and postmenopausal women.

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Ramadan Fasting Raised BDNF by 47% and Serotonin in 29 Healthy Adults: What the Research Shows

A 2017 human study found Ramadan intermittent fasting (15+ h/day for 29 days) raised BDNF by 47%, NGF by 23%, and serotonin significantly in 29 healthy adults.

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Intermittent Fasting Slows Brain Aging and Boosts Executive Function: What the Research Shows

A 2024 Cell Metabolism RCT (n=40 older adults, 8 weeks) found 5:2 fasting reduced brain aging markers, improved executive function, and cut neuronal insulin resistance.

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Intermittent Fasting Reduces Inflammation Markers Across 21 Studies: What the Research Shows

A 2025 network meta-analysis in Nutrients pooled 839 adults across 21 trials and found IF significantly reduced TNF-alpha, CRP, and leptin

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16:8 Intermittent Fasting Reduces Blood Pressure and Inflammation in Trained Adults: What the Research Shows

A randomized crossover trial (n=34, 8 weeks, J Translational Medicine 2016) found 16:8 TRF significantly reduced systolic BP, inflammation markers, and fat mass while preserving muscle.

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Can Eating Only 6am to 3pm Improve Insulin Without Weight Loss?

In a 2018 Cell Metabolism trial, 8 men with prediabetes ate from 6am to 3pm for 5 weeks. Insulin sensitivity and blood pressure improved; weight did not.

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8-Hour Eating Window Improved Blood Sugar in 3 Months

A 2024 RCT in Annals of Internal Medicine (n=108) found that time-restricted eating significantly improved HbA1c and cardiometabolic markers in metabolic syndrome patients.

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Alternate Day Fasting Reduced Liver Fat by 5.48% in 3 Months: What the Research Shows

A 2023 Cell Metabolism RCT found alternate day fasting combined with exercise reduced liver fat 32x more than controls in 3 months, without muscle loss.

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10-Hour Time-Restricted Eating Reduces Weight, Blood Pressure, and Cholesterol in Metabolic Syndrome: What the Research Shows

A Cell Metabolism 2020 pilot study of 19 adults with metabolic syndrome found 12 weeks of 10-hour TRE reduced body weight, blood pressure, and atherogenic lipids without changing diet.

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Intermittent Fasting Outperforms Daily Calorie Restriction for Blood Sugar Control: What the Research Shows

A 2023 Nature Medicine RCT (n=209) found that intermittent fasting with early time-restricted eating improved glucose tolerance significantly more than daily calorie restriction at 6 months.

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NEJM 2022: Time-Restricted Eating vs Calorie Restriction

The 2022 NEJM randomized trial of 139 adults: time-restricted eating added to calorie restriction gave no significant extra weight loss over 12 months.

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One Week of Fasting Improved Parkinson's Motor Symptoms for a Full Year: What the Research Shows

A Luxembourg pilot trial found a week of prolonged fasting followed by daily time-restricted eating improved motor and non-motor Parkinson's symptoms in 31 patients.

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