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.
- Part 2: Time-restricted eating (TRE) in humans: What human trials of daily eating windows suggest about weight and metabolic markers, and why time-restricted eating is not automatically better than eating less.
- 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 plans are not the next level after 16:8.
- 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.
- Part 6: Insulin, glucose, and meal timing: What human trials record for insulin and blood glucose when the eating hours sit earlier or later in the day. The changes are often small, and they often travel with weight loss. Not a diabetes treatment.
- 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.
- Part 10: Open questions (what we still don’t know): What fasting trials still cannot answer: years rather than weeks, who was never enrolled, the clock versus eating less, and why a missing answer is not a plan to copy.
Fasting Fundamentals · How to make fasting easier · Longer fasts · Very long fasts · Using the Clock · Everyday Fasting · Questions from the community · History of Fasting · Humans, Food & Feast–Famine · Fasting, myths and science