Testosterone levels in men are in decline since 1900 due to bad food

The claim that testosterone levels in men have been declining since 1900 due to poor food is supported by some evidence but lacks comprehensive backing from reliable sources. Various studies indicate a decline in testosterone levels over the decades, particularly noting significant drops since the 1980s. However, attributing this decline solely to "bad food" is overly simplistic and not sufficiently substantiated. Factors such as aging, environmental influences, lifestyle changes, and health conditions also play critical roles in testosterone levels. While some sources suggest a correlation between nutritional quality and hormonal health, they do not provide definitive evidence linking the decline in testosterone directly to food quality over the entire century. Thus, while there is a trend of declining testosterone levels, the claim's assertion about the cause requires further evidence and nuance.