Testosterone and cortisol in relationship to dietary nutrients.
Testosterone and cortisol in relationship to dietary nutrients and resistance exercise | Journal of Applied Physiology
So we see, that higher fat intake with resistance training increases T levels. Higher protein seems to lower T levels. Animal protein gives the best T results. PUFA intake also seems to lower T levels.
The PUFA thing is what strikes with me the most.
Lol 12 samples and apparently the one guy with large protein intake had some kind of testosterone problem.
I would be careful about drawing conclusions from an observational study. They identified correlations between nutrients and foods, but did not experimentally alter food consumption.