Obesity risks your health in multiple ways, one of which is being a risk factor for reduced fertility. 

Men, if you are obese, you may have lower sperm counts and motility, an increase in impotence, and poorer semen quality. Obesity-mediated impairment in semen parameters includes several factors: physical, increased scrotal temperature due to heavy fatty tissue deposits, and systemic inflammation and oxidative stress (OS) initiated by various adipose tissue-derived pro-inflammatory mediators. Obesity, via its multifaceted mechanisms, may severely disrupt sperm functions. Paternal obesity reportedly has significant adverse effects on the outcome of assisted reproductive techniques (ARTs) and the overall health of the offspring.

Obesity has an effect on spermatogenesis, 

which is the process of producing sperm. The quality and quantity of sperm production are affected by obesity. Sperm production is affected by testosterone levels, which are reduced in obese men. Obesity has been associated with a decline in sperm count and testosterone levels in men.

Obesity has an effect on the occurrence of Oxidative stress. 

Oxidative stress is one of the main causes of obesity-induced infertility. In obese people, their body tissues and organs are more prone to oxidative damage. Those who were obese were more likely to have low sperm counts than those who were not obese or overweight. They also found that obesity was associated with higher levels of oxidative stress — damage caused by free radicals in the body — which can reduce male fertility by causing DNA damage and apoptosis (cell death).

Obesity has a direct effect on sperm cell damage, 

which can lead to a reduced chance of conception and therefore infertility. The main reason for this is that when you are obese, your body produces higher levels of male hormones that can cause abnormal growth and development in the testes. If you are obese, your levels of testosterone will decrease considerably and may cause problems with sperm production and quality.

Obesity has an effect on reduction in sperm motility, viability and causes a decrease in the testicular function. 

With obesity, the testicles are in a state of chronic hormonal imbalance which leads to decreased testosterone levels and impotence.

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When there is debate over the extent of obesity's importance in contributing to male infertility, but it should not be ignored as a factor. Men need to stay healthy just like women, and there are numerous ways both men and women can prevent or reduce obesity levels. From eating healthier, getting more sleep, and exercising regularly, there are a multitude of things men can do to ensure they're at their peak fertility potential. Add some healthy eating habits and most importantly, exercise to your life. People who are obese or overweight should do whatever it takes to lower the extra pounds. It's a hard task that most people fail in but those who take it seriously will reap the rewards in the end, both in physical and sexual health. 

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References:

• Katib A. (2015). Mechanisms linking obesity to male infertility. Central European journal of urology, 68(1), 79–85. https://doi.org/10.5173/ceju.2015.01.435
• Palmer, N. O., Bakos, H. W., Fullston, T., & Lane, M. (2012). Impact of obesity on male fertility, sperm function and molecular composition. Spermatogenesis, 2(4), 253–263. https://doi.org/10.4161/spmg.21362
• Chaudhuri, G.R., Das, A., Kesh, S.B. et al. Obesity and male infertility: multifaceted reproductive disruption. Middle East Fertil Soc J 27, 8 (2022). https://doi.org/10.1186/s43043-022-00099-2

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