Testosterone levels in men are in decline since 1900 due to bad food
Analysis
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.
Sources
Shows a decline in testosterone levels among young US men from 1999 to 2016 but does not extend findings to 1900 or directly link decline to diet.
Reports population-level declines from the 1970s to early 2000s, with some mention of 1900 but no clear evidence or causal link to diet.
Discusses hourly testosterone fluctuations during sleep, unrelated to long-term trends or diet.
Notes testosterone decline and increased therapy use but lacks direct evidence tying the decline to diet or the 1900 baseline.
Focuses on age-related testosterone decline and symptoms, not on secular trends or dietary causes.
Reviews clinical applications of testosterone therapy without addressing population-level declines or diet.
Discusses hormonal effects of medications, unrelated to long-term testosterone trends or diet.
Reviews late-onset hypogonadism and therapy rationale, not secular decline or dietary causes.
Links testosterone to muscle mass and aging, no mention of long-term trends or diet.
Describes testosterone levels in early life stages, unrelated to secular decline or diet.
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