Thread by @ck_eternity_

Cholesterol levels in the body are regulated separately from dietary cholesterol intake

This means that eating a diet higher or lower in cholesterol does not increase or decrease testosterone

Any hormonal changes that do occur are caused by macro or micro nutrient changes

One of the most notable dietary factors that might actually affect testosterone is fat consumption

This study compared moderate fat consumption to a low-fat diet and found a minor increase with higher fat intake (13% higher total test)
pubmed.ncbi.nlm.nih.gov/8942407/

This study also found a decrease in testosterone and other estrogens when dietary fat is restricted
pubmed.ncbi.nlm.nih.gov/6538617/

It's not clear whether this occurs as a result of the fat itself, or from another factor

Both of these studies seem to indicate that the diets with higher fat intake also included more animal products

Getting more associated nutrients like zinc, vitamin D, and retinol may have played some role as well

I'll also note that a 10-15% testosterone increase or decrease would be imperceptible for most men, and wouldn't be enough to impact things like muscle growth

It's only when multiple factors that alter testosterone levels are combined that really meaningful changes occur