Testosterone levels in young American men have dropped nearly 25% over the last two decades—and it’s not just because of rising obesity. Even men with a healthy weight are showing sharp declines, leaving experts worried about energy, fertility, and long-term health. Researchers point to changes in lifestyle, diet, and possible environmental exposures as contributing factors. With testosterone shaping everything from mood to muscle to sex drive, this downward trend could have major implications for men’s health in the years ahead.
Testosterone and weight loss: the evidence
