Obesity may affect male fertility, according to a new US study. Researchers from Pennsylvania State University College of Medicine, who published a study in the American monthly journal Fertility and Sterility, surveyed 87 healthy men aged 19 to 48 and found that obesity can cause changes in men’s hormone levels, leading to reduced fertility. The team’s Eric Pauly said that obese men had lower levels of testosterone in their blood, as well as lower luteinizing hormone and follicle-stimulating hormone, compared to leaner men. This result suggests that obesity is a factor in infertility. After testing the reproductive hormones of the men surveyed, the researchers found that the higher the level of obesity, the lower the levels of luteinizing hormone and follicle stimulating hormone, and the higher the levels of estrogen. The researchers explained that excessive obesity may contribute to the conversion of testosterone to estrogen, and this change in hormones signals the brain to inhibit the production of luteinizing and follicle stimulating hormones. The researchers noted that past studies have shown that obesity can lead to decreased libido and an increased likelihood of erectile dysfunction. These effects and the hormonal changes found in this study may work together to diminish fertility in obese men. Obese men should pay attention to, especially the large abdominal circumference of male friends, must adhere to exercise, the author suggests: adhere to daily walks, the distance of not less than 4 kilometers or weekly basketball (swimming) about 3 times, each time not less than 1 hour; daily sit-ups 60, push-ups 60. Stick to it will have good results.