Keto diets might boost testosterone in overweight or insulin-resistant guys, but could lower hormone levels in lean guys who aren't eating enough calories.

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Evidence from Studies

Supporting (1)

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THE IMPACT OF KETOGENIC DIET ON MALE REPRODUCTIVE HORMONES: A COMPREHENSIVE REVIEW

Narrative Review

Human

The study shows that keto diets can boost testosterone in overweight men but might lower it in lean men who don’t eat enough, which is exactly what the claim says.

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According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

Source Study

THE IMPACT OF KETOGENIC DIET ON MALE REPRODUCTIVE HORMONES: A COMPREHENSIVE REVIEW

Score: 1

DOI: 10.37557/4wczev27

Similar Assertions

If overweight or obese guys who have trouble using insulin stick to a keto diet for a short time, their testosterone levels might go up — probably because they lose weight, get better at handling sugar, and have less inflammation.

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88%

If lean, active guys follow a keto diet with very few calories for a long time, it might lower key hormones that affect energy and sex drive — even if they're otherwise healthy.

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84%