A significant positive correlation was found between testosterone concentration and percentage of calories from fat intake, total grams of saturated fatty acids, and total grams of monounsaturated fatty acids. Diet may have a significant effect on blood concentrations of testosterone. A higher percentage of calories from protein may reduce blood concentrations of testosterone, and a higher percentage of calories from fat, saturated fat, and monounsaturated fat may result in higher blood concentrations of testosterone. One must be cautious when interpreting these findings, however. Diets were recorded by the subjects and not controlled by the researchers, possibly reducing the accuracy of the records.
More research is warranted.
Volek, J.S., W.J. Kraemer, J.A. Bush, T. Incledon, and M. Boetes. Testosterone and cortisol in relationship to dietary nutrients and resistance exercise.