Caffeine and Hormones: Heavy Coffee Linked to Metabolic Shifts and Testosterone Changes

TL;DR Summary
A Finnish study of over 2,200 middle‑aged adults found heavy coffee drinkers had less visceral fat and more skeletal muscle, possibly due to caffeine boosting metabolism. In men, coffee was associated with higher bioavailable testosterone and SHBG, but slightly lower free testosterone, while women showed more modest hormone changes. These hormonal shifts may help explain coffee’s link to lower diabetes risk, but the study is observational and cannot prove causation.
- How Coffee Affects Your Sex Hormone Levels Nautilus | Science
- Study finds coffee linked to testosterone, body fat and metabolism, especially in men WZTV
- Coffee Drinkers Show Surprising Differences in Fat, Muscle, and Hormones SciTechDaily
- How healthy is coffee, really? Scientific American
- Beloved drink linked to less body fat and more muscle: study New York Post
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