Intermittent Fasting Knowledge Center
Science-backed answers from the book and community.
Waiting for answers
80 unanswered questions
- 01→
Should I fast on days when I'm sick with a cold, or will it slow my recovery?slug:should-i-fast-when-sick-with-cold
10 Jun 2026
- 02→
Should I fast on days when I'm sick with a cold, or will it slow my recovery?
10 Jun 2026
- 03→
Has anyone used fasting to recover from COVID long-haul symptoms?slug:has-anyone-used-fasting-to-recover-from-covid-long-haul-symptoms
10 Jun 2026
- 04→
Has anyone used fasting to recover from COVID long-haul symptoms?
10 Jun 2026
- 05→
My calves cramp badly at night since I started fasting. Is this an electrolyte issue?slug:my-calves-cramp-at-night-fasting
9 Jun 2026
- 06→
My calves cramp badly at night since I started fasting. Is this an electrolyte issue?
9 Jun 2026
- 07→
I feel incredible after a 48-hour fast but not sure if it's healthy to do this regularly. Thoughts?slug:feel-incredible-after-48-hour-fast
9 Jun 2026
- 08→
I feel incredible after a 48-hour fast but not sure if it's healthy to do this regularly. Thoughts?
9 Jun 2026
- 09→
Can someone with a history of gallstones do intermittent fasting safely?slug:can-someone-with-gallstones-do-intermittent-fasting
9 Jun 2026
- 10→
Can someone with a history of gallstones do intermittent fasting safely?
9 Jun 2026
- 11→
Does apple cider vinegar break a fast? I've seen very different answers online.slug:does-apple-cider-vinegar-break-a-fast
8 Jun 2026
- 12→
Does apple cider vinegar break a fast? I've seen very different answers online.
8 Jun 2026
- 13→
I started fasting and my menstrual cycle became irregular. Has this happened to you?slug:i-started-fasting-menstrual-cycle-irregular
8 Jun 2026
- 14→
I started fasting and my menstrual cycle became irregular. Has this happened to you?
8 Jun 2026
- 15→
Can fasting help with hormonal belly fat after menopause?
8 Jun 2026
- 16→
Can fasting help with hormonal belly fat after menopause?
8 Jun 2026
- 17→
Does it matter if my eating window changes by an hour or two each day, or does it need to be exact?
7 Jun 2026
- 18→
Does it matter if my eating window changes by an hour or two each day, or does it need to be exact?
7 Jun 2026
- 19→
I lost weight the first month then gained 2kg back while doing the same thing. What happened?
7 Jun 2026
- 20→
I lost weight the first month then gained 2kg back while doing the same thing. What happened?
7 Jun 2026
- 21→
How do you fast when your job requires you to socialize over lunch every day?
7 Jun 2026
- 22→
How do you fast when your job requires you to socialize over lunch every day?
7 Jun 2026
- 23→
Can I do intermittent fasting if I have an underactive thyroid (hypothyroidism)?
6 Jun 2026
- 24→
Can I do intermittent fasting if I have an underactive thyroid (hypothyroidism)?
6 Jun 2026
- 25→
I feel euphoric and almost high when deep in a fast. Is this normal and what causes it?
6 Jun 2026
- 26→
I feel euphoric and almost high when deep in a fast. Is this normal and what causes it?
6 Jun 2026
- 27→
My breath smells terrible when I'm fasting. Is this just ketosis and will it ever go away?
6 Jun 2026
- 28→
Has anyone used fasting to get off blood pressure medication? What was your experience?
5 Jun 2026
- 29→
Has anyone used fasting to get off blood pressure medication? What was your experience?
5 Jun 2026
- 30→
Does the type of exercise matter when fasting — cardio vs. weights?
5 Jun 2026
- 31→
Does the type of exercise matter when fasting — cardio vs. weights?
5 Jun 2026
- 32→
I'm 65 and my doctor says fasting is risky at my age. Is this true?
5 Jun 2026
- 33→
My sleep is much worse since I started fasting — I wake up at 3am every night. What's going on?
4 Jun 2026
- 34→
My sleep is much worse since I started fasting — I wake up at 3am every night. What's going on?
4 Jun 2026
- 35→
Can intermittent fasting help with inflammation from arthritis?
4 Jun 2026
- 36→
Can intermittent fasting help with inflammation from arthritis?
4 Jun 2026
- 37→
I drink 3L of water during my fast but still feel dehydrated. What's happening?
4 Jun 2026
- 38→
I drink 3L of water during my fast but still feel dehydrated. What's happening?
4 Jun 2026
- 39→
Does stress eating get better with fasting, or does fasting make it worse?
4 Jun 2026
- 40→
Does stress eating get better with fasting, or does fasting make it worse?
4 Jun 2026
- 41→
What is the best way to break a 24-hour fast without feeling sick?
3 Jun 2026
- 42→
What is the best way to break a 24-hour fast without feeling sick?
3 Jun 2026
- 43→
I feel worse on fasting days than non-fasting days. Is that normal at the beginning?
3 Jun 2026
- 44→
I feel worse on fasting days than non-fasting days. Is that normal at the beginning?
3 Jun 2026
- 45→
Can fasting cause constipation? Mine has been really bad since I started.
2 Jun 2026
- 46→
I've been doing 18:6 for 4 months with no results. Should I switch to OMAD?
2 Jun 2026
- 47→
Does drinking decaf coffee have the same benefits as regular coffee during fasting?
2 Jun 2026
- 48→
Can I have a small handful of nuts during my fast if I'm really struggling? Will it ruin everything?
2 Jun 2026
- 49→
I feel great but my BMI is still "obese." Should I care about BMI or just focus on how I feel?
1 Jun 2026
- 50→
Has anyone reversed pre-diabetes with intermittent fasting alone, without medication?
1 Jun 2026
- 51→
My partner wants to do intermittent fasting but they have a history of anorexia. Is it safe?
31 May 2026
- 52→
I always eat healthy during my eating window but I'm not losing weight. What could be the issue?
30 May 2026
- 53→
Does black tea break a fast the same way coffee doesn't, or are they different?
30 May 2026
- 54→
Has anyone tried fasting while pregnant? I know it's controversial but curious about experiences.
29 May 2026
- 55→
My blood sugar drops to 60 mg/dL when fasting and I feel shaky. Should I stop?
29 May 2026
- 56→
I'm a nurse doing 12-hour shifts. How do I fit fasting around a schedule that changes every week?
29 May 2026
- 57→
Can intermittent fasting help with acid reflux or GERD?
29 May 2026
- 58→
I feel mentally sharper when fasting but my gym performance dropped. Is this a phase that passes?
28 May 2026
- 59→
Does it matter what time of day I eat my one meal on OMAD, or can it be breakfast?
28 May 2026
- 60→
I've been fasting for 6 months and have lost 20kg. Now I want to stop losing weight — how do I maintain?
28 May 2026
- 61→
What is the difference between hunger and wanting food out of habit? How do you tell them apart?
28 May 2026
- 62→
I feel amazing fasting but my family is worried I have an eating disorder. How do I explain this to them?
28 May 2026
- 63→
My skin has been breaking out since I started fasting. Has this happened to anyone else?
28 May 2026
- 64→
How do you handle hunger at work when you can smell food from the kitchen or break room?
27 May 2026
- 65→
My stomach makes very loud noises when I'm fasting. Is this normal and how do I manage it in public?
27 May 2026
- 66→
I've been told I need to eat every 3 hours for muscle building. Can I build muscle while fasting?
27 May 2026
- 67→
Does the length of the eating window matter, or is it just about when you start and stop?
27 May 2026
- 68→
I feel great fasting Monday to Friday but always overeat on weekends. How do I stop undoing my progress?
27 May 2026
- 69→
How do you fast while traveling across time zones? Do you adjust your window for the new timezone?
26 May 2026
- 70→
Is it OK to drink black coffee right when I wake up at 6am if my fasting window started at midnight?
26 May 2026
- 71→
I've been fasting for 3 months and feel great but my cholesterol went up. Should I be worried?
26 May 2026
- 72→
Can I fast during Ramadan and combine it with 16:8 or OMAD for better results?
26 May 2026
- 73→
I'm 58 and my metabolism feels like it's completely stopped. Is it too late for fasting to work for me?
25 May 2026
- 74→
Has anyone reversed their fatty liver with intermittent fasting? How long did it take?
25 May 2026
- 75→
I get incredibly hungry at exactly 11am every day even though I'm eating a big dinner at 7pm. Any tips?
25 May 2026
- 76→
Does intermittent fasting affect breast milk supply? I'm still nursing my 8-month-old.
24 May 2026
- 77→
My husband thinks skipping breakfast is bad for your heart. Where can I find research to show him?
24 May 2026
- 78→
I lost 10kg quickly then completely stalled for 6 weeks. How do I break a plateau?
24 May 2026
- 79→
Can you drink sparkling water during the fasting window or does the carbonation break the fast?
24 May 2026
- 80→
My hair started falling out after 3 months of fasting. Has this happened to anyone else?
24 May 2026