Meat and Dairy Consumption Linked to Lower Testosterone Levels, Study Finds
Research from the University of Eastern Finland suggests a correlation between higher intake of animal protein and decreased testosterone concentrations in men.
Men who consume more meat and dairy products may have lower testosterone levels, according to a study published by researchers at the University of Eastern Finland.
The study analyzed the diets of 2,546 men aged 42 to 60 over four days, dividing them into four groups based on their intake of animal and plant protein.
Findings indicated that men with the highest intake of animal protein had, on average, lower total testosterone concentrations compared to those with the lowest intake. Conversely, men with a higher intake of plant-based protein sources such as legumes, grains, nuts, and seeds showed higher testosterone concentrations than those with the lowest intake. However, experts emphasized that the differences observed in both cases were marginal.
Testosterone plays a crucial role in regulating sex drive, building muscle and bone strength, supporting energy levels, and aiding in red blood cell production. Normal total testosterone levels in men are generally considered to be between ten and 30 nanomoles per liter, with levels naturally declining by about 1% per year after age 30. Factors such as obesity and type 2 diabetes can also contribute to lower testosterone levels.
Further analysis revealed a link between higher consumption of dairy protein, particularly fermented dairy, and lower total testosterone concentrations. In contrast, a greater intake of plant protein, especially from non-grain sources like vegetables, legumes, nuts, and seeds, was associated with higher total testosterone levels.
The researchers noted that the precise reasons for these opposing associations remain unclear. One hypothesis is that individuals with higher plant protein intake may also consume more fiber and unsaturated fats, contributing to healthier overall diets. Conversely, those with higher animal protein intake might consume more saturated fat and cholesterol. The study authors suggested that factors beyond diet, such as inflammation, insulin regulation, and variations in testosterone transport within the bloodstream, could also be involved.
"Higher animal protein intake was associated with lower circulating testosterone, whereas plant protein intake showed modest positive associations," the study's authors stated.