Eating More Fat May Boost Borderline Low Testosterone
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"Low-fat diets appear to decrease testosterone levels in men, but further randomized controlled trials are needed to confirm this effect," the authors of a meta-analysis of six small intervention studies conclude.

Higher endogenous testosterone levels are associated with reduced chronic disease risk and mortality. Since the mid-20th century, there have been significant changes in dietary patterns, and men’s testosterone levels have declined in western countries. Cross-sectional studies show inconsistent associations between fat intake and testosterone in men.

Studies eligible for inclusion were intervention studies, with minimal confounding variables, comparing the effect of low-fat vs high-fat diets on men’s sex hormones. 9 databases were searched, yielding 6 eligible studies, with a total of 206 participants.

Results:
-- There were significant decreases in sex hormones on low-fat vs high-fat diets.

-- Standardized mean differences with 95 % confidence intervals (CI) for outcomes were: total testosterone [-0.38]; free testosterone [-0.37]; urinary testosterone [-0.38]; and dihydrotestosterone [-0.3].

-- There were no significant differences for luteinizing hormone or sex hormone binding globulin.

-- Subgroup analysis for total testosterone, European and North American men, showed a stronger effect.

Conclusively, low-fat diets appear to decrease testosterone levels in men, but further randomized controlled trials are needed to confirm this effect. Men with European ancestry may experience a greater decrease in testosterone, in response to a low-fat diet.

Source: https://www.sciencedirect.com/science/article/abs/pii/S0960076021000716?via=ihub
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