I will leave it to others with specific expertise to comment on any relationship between ingestion of sugar (including fruit sugar) and endogenous testosterone levels. That aside, in general, my view would be that if you naturally always have completely normal non-diabetic blood sugars (lucky you), then enjoy fruits (and other sugars and carbohydrates) whenever you so desire. If your blood sugars are otherwise, then a low-carbohydrate diet is indicated and fruits typically should be avoided.when it comes to veggies, fruits and sugar. is it better to avoid them for healthy T? (talking about sugar inside fruits and veggie)