Yes, it has been scientifically proven that those men with a body mass index higher than 30 have a worse seminal quality and, therefore, present greater difficulties to achieve a natural pregnancy.
In fact, men with excess weight tend to have low levels of androgens, such as testosterone, the hormone responsible for regulating the formation of sperm in the testicles. As a consequence of this decrease in male sex hormones, spermatogenesis is affected and oligozoospermia may appear.
Read the full article on: What treatments are available for male infertility? ( 50).
Embryologist on CREA
Degree in Biochemistry and Biomedical Sciences from the University of Valencia (UV). Master's Degree in Biotechnology of Human Assisted Reproduction from the UV and the Valencian Infertility Institute (IVI). Presently, she works as a Research Biologist.