Associations of dietary proteins with serum total testosterone and sex hormone-binding globulin concentrations in middle-aged men.

Studied

A cross-sectional study examined associations between dietary protein sources, testosterone and sex hormone-binding globulin.

Who / model

The study included 2,546 Finnish men aged 42–60, using four-day food records and adjusted statistical models.

Studied dose & schedule

Dose and schedule have not yet been extracted for this summary.

Found

Compared with the lowest-intake group, the highest animal-protein group had total testosterone 1.2 nanomoles per litre lower; the highest plant-protein group had levels 1.1 higher. The hormone-binding protein followed the same directions. These were associations, not effects of assigned diets.

Limits

Study limitations were not stated in the abstract. Methodological quality has not been appraised.

Read summary source ↗ · Prepared 9/15/2026 · AI-assisted, source-based summary