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Higher animal protein intake was associated with lower blood testosterone levels, while higher plant protein intake was associated with higher levels, according to a new study from the University of Eastern Finland. The findings were published in the International Journal of Food Sciences and Nutrition.

Testosterone is a key male sex hormone and is important for, among other things, muscles, bones and sexual function. Testosterone levels are influenced by factors such as age, excess weight and lifestyle, but relatively few studies have examined the associations between testosterone levels and diet, particularly protein intake.

The new findings are based on data from the ongoing Kuopio Ischemic Heart Disease Risk Factor Study at the University of Eastern Finland. The study included 2,546 men aged 42–60 years and living in eastern Finland.

Their dietary intake was assessed using four-day food records between 1984 and 1989, and concentrations of total testosterone and sex hormone-binding globulin (SHBG) were measured in blood samples. SHBG influences total testosterone concentrations in the blood.

2 nmol/l lower than those of men with the lowest intake. 1 nmol/l higher than those of men with the lowest intake.

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