However, the only thing that has been demonstrated thus far is the connection between waist circumference and decreased seminal volume and sperm concentration, and being overweight (defined as having a body mass index (BMI) of more than 25). However, no solid proof of how it influences their motility and morphology has been found.
The fact is that obese men have lower levels of testosterone and other hormones in their semen than lean men, which may be associated to hypogonadism, which would have a detrimental impact on the factors that affect male fertility, including DNA concentration, motility, morphology, and fragmentation.
According to A Study
These findings, however, are not particularly informative on their own because a seminal volume of 1.5 to 5 milliliters is considered to be normal. Furthermore, this study did not find any correlation between BMI and waist circumference and sperm concentration, sperm vitality, or an increase in sperm with malformations.
In fact, a few of the males who participated in the study had at least one child in the past. In order to draw a conclusion, our sexologists in Delhi could only confirm that obesity can affect male fertility to a certain extent but not prove a causal link between obesity and infertility.