Weight loss in obese boys may protect their reproductive function in future: Study

In this study, Dr Solène Rérat and colleagues at Angers University Hospital in France investigated how a 12-week educational weight loss programme in 34 boys, aged 10 – 18 years, affected markers of Leydig and Sertoli cell function, as well as metabolism. The boys had a healthy, balanced diet, undertook physical activity for at least 1 hour per day, according to international recommendations, and had weekly individual sessions with a dietician. Before and after the programme, levels of reproductive hormones, body fat composition and blood glucose were measured for comparison. Over the 12 weeks, the boys significantly lost weight and had improved insulin levels, as well as increased testosterone levels. No significant changes were found in markers of Sertoli cell function. Since fat cells produce an enzyme that converts testosterone to an oestrogen, the actual loss of fat mass may account for some of the increased testosterone levels, in addition to reversal of Leydig cell altered function.

Dr Rérat states, "These findings underline the need to consider childhood obesity as a factor in future fertility issues. We strongly recommend that early management of childhood obesity is necessary to reverse these impairments, and to help prevent future reproductive problems, as well as lowering the risks of other debilitating diseases."

The team now plan to measure reproductive function of the group more long-term and to expand it to include more participants to gather more data to confirm and extend these findings.

Dr Rérat cautions, "Our study only evaluated the effects in a small number of obese boys after a twelve-week therapeutic educational program. Further studies with longer follow up are needed to help us fully study the effect of weight reduction on reproductive function."