The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
mice that ate a highly palatable high-fat diet, a great tasting diet, but only during a restricted feeding window of each 24 hour cycle maintained or lost weight over time, whereas mice that ingested the same diet, same amount of calories, but had access to those calories around the clock, gained weight, became obese and quite sick.
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the mice that restricted their feeding window to a particular portion of eight hours of every 24 hour cycle actually showed some improvement in important health markers.
So just, like, to reiterate, these mice that were fed a high-fat diet, they were fed the same amount of calories, but those that ate during their waking hours... ...so for mice, which is night within, I think, it was 12 hours... ...they gained…I'm sorry, they had 70% less fat mass.
So they had 28% less body mass total. And that change in body mass is mostly due to fat because they had 70% less fat.
And then other group got the same number of calories and the same type of food, exactly identical food, but they had to eat all their food within 8 to 12 hours in nighttime. So in some experiments we have done 8 hours, 9 hours, 10 hours, 12 hours, like that, and the most surprising thing is…and this is something that everybody, a lot of laboratories around the world do. There are 11,000 papers saying high-fat diet causes obesity. And we said, "Okay, so now we control for time." So since time was restricted, calorie was not restricted. So that's why we call it time-restricted feeding. And surprisingly, the mice that ate for 8 to 12 hours, they did not become obese, diabetic, and they had a normal liver function and they had normal cholesterol, etc.
Then we consistently find that the mice that eat all their food within this 8 to 12 hours window are healthier than ad libitum fed mice.
And we have done that experiment not with a standard diet, with a high fat diet. And with a high fat diet they are better than ad libitum fed.
But if we feed the mice the same number of calories from the same diet source, whether it's healthy diet or unhealthy diet, they get to eat all of that food within 8 to 10 hours, then we can protect them from all these diseases. And if the mice are already having a disease and we put them in time-restricted feeding for 8 to 10 hours, we can reverse those diseases.
Time-restricted eating produces fat loss independent of total calories.
A 72-hour fast measurably improves autophagy markers in healthy adults.
One-meal-a-day (OMAD) eating patterns increase all-cause mortality in long-running cohort data.
Eating the largest meal before 3pm improves 24-hour glucose vs. an evening-heavy schedule, calorie-matched.