The lower temperature in the scrotum is a prerequisite for normal spermatogenesis.
<Oxford Textbook of Medicine> by David A. Warrell, Timothy M. Cox, John D. Firth.page. 282, (line 32). Published by Oxford University.
- Heat can reduce sperm count and testosterone production.
University of Wisconsin Integrative Medicine
- According to this study from Nakamura et al. Human testis perform at their best when they’re around 31-36 °C (87-96 °F). anything hotter than that will negatively impact DNA synthesis, spermatogenesis, and most likely also testosterone production.
- A low testosterone [hypogonadism or testosterone deficiency syndrome (TDS)] may be present in 30% of men and present in a number of different ways.
There is increasing evidence that TDS is associated with all-cause mortality and in particular cardiovascular death
European Heart Journal (OXFORD Academic)
- Low levels of testosterone in men could increase their risk of developing diabetes.
The University of Edinburgh
- Low Testosterone Associated With Obesity and the Metabolic Syndrome Contributes to Sexual Dysfunction and Cardiovascular Disease Risk in Men With Type 2 Diabetes
American Diabetes Association
- Male Obesity Linked to Low Testosterone Levels
University of Buffalo
8. Low testosterone linked to Alzheimer’s disease
Low Testosterone, Obesity and Alzheimer’s Disease Are Linked
9. males who spend time in low temperatures prior to mating will produce offspring with more active brown adipose tissue…the offspring of males kept in cool conditions were better protected against excess weight—they gained less weight on a high-fat diet—and against metabolic disorders…
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