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How can obesity affect testosterone levels and fertility in men?

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Close-up of hands using a measuring tape to measure the waist circumference of an obese man wearing a white shirt and beige pants. — obesity The excessive accumulation of body fat can cause serious medical conditions.

Obesity is a serious medical disorder that significantly impacts male reproductive health. Excess body fat is directly associated with decreased testosterone levels in men.1

This hormonal imbalance contributes to an increased risk of fertility problems. While male infertility can stem from various factors—such as sperm production issues, anatomical abnormalities, or conditions like a varicocele—obesity serves as a distinct, modifiable risk factor that impairs reproductive function. Addressing obesity is therefore an essential component of maintaining overall health and reproductive well-being.12