After a 6-day water-only fast, a man’s metabolism resets certain chemicals in his body back to normal within a week of eating again—even if he hasn’t regained all his weight yet.

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Evidence from Studies

Supporting (1)

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Community contributions welcome

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Exploring the effect of prolonged fasting on kynurenine pathway metabolites and stress markers in healthy male individuals

Randomized Controlled Trial

Human

2024 Aug

The study found that after 6 days of fasting, the body's chemical changes related to stress and metabolism went back to normal within a week of eating again, even if weight didn’t fully return — just like the claim says.

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Source Study

Exploring the effect of prolonged fasting on kynurenine pathway metabolites and stress markers in healthy male individuals

Score: 46

DOI: 10.1038/s41430-024-01451-7

Similar Assertions

If healthy guys don't eat for six days, their bodies show higher levels of certain chemicals linked to how the body handles stress and metabolism, with the highest levels seen right at the end of the fast.

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When you fast or eat less, certain chemicals in your body from the kynurenine pathway help your body respond in ways that keep you healthier for longer.

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Fasting for six days with no calories may lower certain chemicals in the blood linked to brain health — one drops because you're not eating, and the other suggests your body is producing fewer harmful substances.

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