Researchers from Massachusetts General Hospital in Boston have found that glucose ingestion was associated with a significant decrease in the male hormone testosterone.

The study, published in the journal Clinical Endocrinology, shows that 75g of sugar intake causes a 25 per cent drop in testosterone levels for up to two hours after consumption.

https://www.diabetes.co.uk/news/2016/sep/men-experience-an-abrupt-decrease-in-testosterone-levels-after-sugar-intake,-study-finds-99746064.html