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.
Even when mice eat standard diet, normal chow, which is supposed to be healthy, and mice actually eat most of their food, nearly 70% of food during night time. They eat a little bit during daytime, but if they completely restrict that to 8 to 12 hours, then their muscle mass goes up, their fat mass decreases, and they are more coordinated.
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So the endurance is a very interesting aspect because we see that only when mice eat for eight to nine hours. We don't see that improved endurance when they eat for 12 hours, although their body weight is maintained as nine hours. So this was interesting. So that's why, as you pointed out, clearly mitochondria might be playing a role, and in fact, in liver we do see increase mitochondria volume, and increase endoplasmic reticulum volume, so ER and mitochondria kind of work together. That's what we are learning these days. So the mitochondria volume increases. Another thing is we do see less damaged mitochondria in liver when they eat only from eight to nine hours.
you're going to get benefits you're going to get the intermittent fact some of the intermittent fasting benefits so you know they're there a lot there are lots of things throughout you know human history there are periods of time we didn't have access to food and so you know we have all these amazing genetic pathways that are meant to be switched on and they're not going to be switched on unless you stop eating for a certain period of time and so you and you miss out and these these genetic pathways are pathways that are often stress response pathways so there are pathways that are that are turned on that help you deal with the stresses of aging better so these are pathways that are clearing out you know things that are accumulating within the cell on a daily basis dead cellular debris they're cleaning or cleaning out organelles inside of your cells that are dysfunctional like mitochondria replacing them with new mitochondria it's kind of like this rejuvenation period
We have done a lot of molecular studies now looking at different organs, looking at the whole genome sometimes, hundreds of metabolites, and we find the molecular mechanisms by which this time-restricted eating is triggering breakdown of toxic materials, detoxification during the fasting time, better uses of fat, protein, and carbohydrate during day and night, and improvement in metabolism and mitochondria function that reduces reactive oxygen species, all of these good things, and improved autophagy.
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.