Middle-aged and older men who are overweight, tend to have lower testosterone levels. This is associated with higher incidence of type 2 diabetes and metabolic syndrome. Obesity and medical co-morbidities contribute to the decline in testosterone levels. A review and meta-analysis of observational studies, found that men with testosterone levels ≥15.6 nmol/L had a 42% reduced risk of type 2 diabetes, compared to those with testosterone levels ≤15.5 nmol/L.
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