In 2025, Jessica M. Preston and Romain Barrès from the University of Copenhagen studied 43 men aged 20-35 in a crossover trial. Participants spent three weeks on ultra-processed diets (like processed meats and snacks) and three on unprocessed diets (whole foods), with equal calories, followed by a washout period. They measured weight, hormones, and pollutants in blood.

In 2025, S. Fattahi and a team studied men with prostate cancer in a randomized cohort, followed over time. They analyzed testosterone levels at diagnosis, adjusting for age, cancer stage, and treatments like hormone therapy, to check links with cancer severity and death rates.

A 2025 study cited in Muscle & Fitness by the National Library of Medicine found that drinking green tea daily for 20 years raised testosterone levels by 30% in men compared to non-drinkers.

Stevia is marketed as a natural, plant-based, zero-calorie sweetener—but multiple studies suggest it might act more like birth control than a harmless sugar alternative.