What Research Suggests
How to read fasting studies, what TRE and related trials suggest, what headlines get wrong, how training sits with a window, what papers report as harm, and what is still unknown. Always with limits.
Educational only. Not medical advice. See our disclaimer.
Start a timer: 16:8 timer · OMAD timer · online fasting timer.
- Part 1: How to read fasting research: A calm method for reading fasting studies and headlines: study type, who was studied, what was compared, and what a paper cannot decide for you. Not medical advice.
- Part 2: Time-restricted eating (TRE) in humans: What human trials of daily eating windows suggest about weight and metabolic markers, and why TRE is not automatically better than eating less. Not medical advice.
- Part 3: Alternate-day & prolonged fasting studies: What human trials of alternate-day fasting, 5:2, and multi-day fasts actually test, and why those protocols are not the next level after 16:8. Not medical advice.
- Part 4: Metabolic switching & fuel use: After you stop eating, the body gradually uses less stored carbohydrate and more fat, and the liver makes more ketones. Researchers call that shift metabolic switching. It is not a switch that flips at hour 16.
- Part 5: Autophagy: what it is and what headlines get wrong: Autophagy is ongoing cellular recycling, not a switch that flips at hour 16 or 24. What the word means, why headlines overclaim, and what the timer label is for. Not medical advice.
- Part 6: Insulin, glucose, and meal timing: What human fasting research actually says about insulin, glucose, and when you eat, including early vs late windows. Not a treatment claim. Not medical advice.
- Part 7: Weight, body composition, and adherence: What human fasting trials actually measure on the scale, in body fat versus lean mass, and in whether people stay with the assigned hours. Not a weight-loss program.
- Part 8: Fasted weight training and fasting after a workout: Can you do fasted weight training before you eat? Can you keep a daily fasting window and still lift? What human trials say about those two questions.
- Part 9: Safety signals in the literature: What fasting trials actually report as harms, who they leave out, and why “the studies say it is safe” is not the same as safe for you. Not medical advice.
- Part 10: Open questions (what we still don’t know): What fasting trials still cannot answer: years not weeks, who is missing, clock versus calories, and why a hole in the evidence is not a protocol. Not medical advice.
Fasting Fundamentals · How to make fasting easier · Longer fasts · Very long fasts · Using the Clock · Everyday Fasting · History of Fasting · Humans, Food & Feast–Famine