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Muscle & Strength

Training, protein, and supplement research on building and keeping muscle and strength, from creatine timing to how older men hold onto lean mass.

35Studies

35Human studies

2026Most recent

17Countries

BMI is associated with sperm quality and sex hormones in men: a meta-analysis.

Frontiers in endocrinology2025n = 8,443 men (3,467 normal BMI, 3,444 overweight, 1,532 obese)

Meta AnalysisHuman

This meta-analysis (a study that statistically pools many earlier studies) looked at how body mass index (BMI, a weight-for-height number used to flag over- or under-weight) relates to sperm quality…

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