Er, it seems like intermittent fasting generally reduces testosterone production. For example, in Dr. John Berardi’s experiments with intermittent fasting, his testosterone levels dropped from nmol/L to nmol/L after 6 months. The reason for that is probably fairly simple: testosterone is sensitive to energy balance. When you’re not eating enough calories overall, your testosterone will drop. Since the whole purpose of intermittent fasting is to drop you into a calorie deficit, it can reduce testosterone production. Mind you, the different Dr. Berardi experienced was hardly anything, and he got fantastic results, so intermittent fasting certainly worked great for him.