How much obesity and diabetes do impair male fertility?

Background: Subfertility in obese and diabetic men during the reproductive age is evident, but the mechanisms by which obesity and diabetes mellitus cause male infertility are not entirely understood. The current study aimed to evaluate the effects and potential mechanisms of obesity and diabetes on male fertility.

Methods: We enrolled control = 40, obese = 40, Lean-DM = 35, and Obese-DM = 35 individuals.