Men with increased body mass index( BMI) were significantly more likely to be infertile than normal-weight men, according to research conducted at the National Institute of Environmental Health Sciences( NIEHS), one of the National Institutes of Health.

• 美国国立环境卫生科学研究所进行的一项研究发现，与正常体重的男性相比，体重指数增加的男性不育可能性更大。