How Coffee Affects Your Sex Hormone Levels

Coffee, enjoyed by two-thirds of American adults daily, is linked to numerous health benefits. A new Finnish study reveals how heavy coffee consumption affects sex hormones and metabolism in middle-aged adults. Researchers from the University of Oulu analyzed data from over 2,200 participants and found that those drinking more coffee had lower total and visceral fat, as well as higher skeletal muscle mass, despite having similar body mass indexes.

This could be due to caffeine's impact on the sympathetic nervous system, which increases resting metabolic rate, energy expenditure, and thermogenic lipolysis (fat burning to produce heat).

In men, heavy coffee drinkers showed healthier glucose-insulin profiles, higher bioavailable testosterone, and more sex hormone-binding globulin (SHBG). However, their free testosterone levels were slightly lower. Bioavailable testosterone is the usable form of the hormone, while SHBG controls the amount of bioavailable sex hormones by binding to and deactivating them.

The researchers suggest that these hormonal pathways might contribute to coffee's association with a reduced risk of diabetes in both sexes. For women, the hormone associations were more modest, with slightly elevated SHBG and lower levels of free androgens. Lower SHBG levels have been linked to an increased incidence of type 2 diabetes in both women and men.

While this study is observational and cannot establish cause and effect, it suggests that coffee's impact on sex hormones and metabolism might be more complex than previously thought. Regardless of the research, coffee remains a beloved morning ritual for many.