The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
So in that way fasting, if you're measuring fasting or you're defining fasting in terms of ketone body formation above a certain level, then that may kick in after 24 hours. Or if you have that threshold even much higher than fasting, maybe 20, 48, or 72, or even 96 hours before you see that level of ketone bodies that can be your definition of fasting.
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Native comments, Twitter mentions, and Reddit threads about this claim — surfaced together so the conversation isn't fragmented across platforms.
Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
Would love a "what would change this verdict" RSS feed. Sign me up if it exists.
So in that way I think the way you define fasting will determine whether 24 hours, 48 hours, 96 hours, or even 12 hours or 16 hours is fasting.
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.