This review focuses on the potential impact of male obesity on sperm quality and function – a long-debated topic. The adverse effects of obesity on sperm parameters can significantly impair male and couple fertility, resulting in an increased necessity for fertility assistance among obese men. Furthermore, although more definitive research is needed, these individuals often experience poorer outcomes in assisted reproductive technologies. Image by João Ramalho-Santos.

This article belongs to the Collection Dedication to Jim Cummins.