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

Multiple studies indicate that average testosterone levels in men, particularly in younger cohorts, have declined over recent decades, primarily documented from the late 20th century onward. However, evidence extending this trend back to 1900 is lacking or inconclusive. While some research suggests environmental and lifestyle factors, including diet, may influence testosterone levels, attributing the decline solely or primarily to "bad food" is an oversimplification unsupported by robust scientific consensus. Other factors such as obesity, chemical exposures, stress, and changes in health status also contribute. The claim that testosterone levels have been declining since 1900 due to poor diet is therefore only partially supported: there is evidence of decline in recent decades, but the timeline and causality regarding "bad food" remain insufficiently proven.