Science-backed answers from the research and the community.
Editorial articles
How to Tell If You Broke Your Fast, and the 1–8 Hours It Takes to Get Back In
If you ate something during your window, you did not ruin anything: one bite puts you back in fat-burning within 1 to 2 hours, a full meal within 4 to 8 hours, and every hour you already fasted still counts toward the total.
Read answer →
How to Not Feel Dizzy When Fasting: The Salt-Water Fix
Yes, intermittent fasting can cause dizziness — low insulin flushes out sodium. Water with a quarter-teaspoon of salt fixes it in 10–15 minutes. Plus red flags.
Read answer →
Intermittent Fasting Nausea: Why You Feel Sick and 6 Fixes
Nausea and dizziness while fasting are usually electrolytes, not illness — salt water fixes it in 30–60 min. Plus the 6 signs that mean stop and see a doctor.
Read answer →
Does Intermittent Fasting Affect Sleep?
Find out how intermittent fasting affects sleep quality. Most people sleep better—here's why, plus the one evening mistake that keeps people awake.
Read answer →
Is It Normal to Feel Worse Before Feeling Better on Intermittent Fasting?
Many people feel worse in the first week of intermittent fasting. Here's why the adaptation phase happens, how long it lasts, and what to do about it.
Read answer →
Intermittent Fasting and H Pylori — Does Intermittent Fasting Cause Ulcers or Gastritis? 6 Real Causes
No — ulcers and gastritis come from H. pylori and NSAID painkillers, not from fasting. Six ordinary causes explain almost all fasting stomach pain, and each one has a fix.
Read answer →
Why Does My Breath Smell Bad During Intermittent Fasting?
Keto breath during intermittent fasting is a sign your body is burning fat. Here's exactly what causes it, how long it lasts, and seven practical fixes.
Read answer →
Does Intermittent Fasting Cause Constipation?
Intermittent fasting can trigger constipation in the first weeks. Learn exactly why it happens and the simple fixes that get your digestion moving again.
Read answer →
Why Do I Get Headaches When Intermittent Fasting?
Fasting headaches are almost always caused by dehydration, low electrolytes, or caffeine withdrawal. Here's why they happen and how to fix them quickly.
Read answer →