BMI correlates to T levels, but diet doesn't in this study. Age also correlated to T reduction.
PMID: 32468110
Men on a vegan diet had higher T levels both before and after exercise.
More support for BMI being a factor for hormonal disruption. Reduction in SHBG (protein that binds hormones) is associated with obesity and reduction in T levels.
PMID: 38116769
Vegan men have more SHBG, suggesting higher T levels (no difference in blood serum).
PMID: 2400756