2025-10-24 14:02:40

Boys who are obese in childhood may grow up to have shorter penises as adults.

Scientists at Hanoi Medical University Hospital in Vietnam studied nearly 300 men to explore the link between body weight and penis size — and found that childhood obesity, rather than adult weight, has a lasting impact on development.

Those who were obese as children had significantly shorter flaccid and stretched penis lengths compared with men who maintained a healthy weight. The researchers believe this may be due to reduced testosterone levels during puberty, a key hormone responsible for male sexual development.

In contrast, the team found that adult obesity only affected the appearance of the penis — such as making it appear smaller due to fat deposits — rather than its actual size.

Writing in the Journal of Sexual Medicine, the scientists said: “Childhood obesity is associated with penile growth, while adulthood obesity relates to the appearance of the penis rather than the actual size. Thus, there is a need for early intervention to mitigate the potentially long-term effects of childhood obesity on penile development.”

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