But a relationship was found for men who were not overweight. Doesn't mean much in my opinion. The abstract says:
Data were analyzed for 2581 men (≥20 years old) who participated in the cycles of the NHANES 1999–2004 and 2011–2012, a cross-sectional study. Testosterone (ng/mL) was measured by immunoassay among men who participated in the morning examination session. We analyzed 24-h dietary recall data to estimate caffeine intake (mg/day). Multivariable weighted linear regression models were conducted. We identified no linear relationship between caffeine intake and testosterone levels in the total population, but there was a non-linear association (p[SUB]nonlinearity[/SUB] < .01) among men with waist circumference <102 cm and body mass index <25 kg/m[SUP]2[/SUP]
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