Research
Energy balance
Obesity increases scrotal temperature due to increased scrotal adiposity, which reduces sperm motility and concentration and increases DNA damage.
Excess fat around the scrotum traps heat, which damages sperm. Reducing this fat can lower testicular temperature and improve sperm quality.
GoodSupportsHIGH confidence
Increased scrotal adiposity leads to increase gonadal heat, continuously hurting spermatogenesis... increased testicular heat can substantially reduce sperm motility and concentration, and increase sperm DNA damage
Why this rating
Supported by animal models and clinical observations.
Source
Obesity, a serious etiologic factor for male subfertility in modern society
Yue Liu et al. · Reproduction · 2017
DOI 10.1530/rep-17-0161
narrative_reviewCited 249×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
More from this paper
- Male obesity causes male subfertility through hormonal imbalance (hypogonadism), chronic inflammation, oxidative stress, and increased scrotal temperature, leading to reduced sperm quality and DNA damage.Good
- Obesity-induced hypogonadism reduces testosterone and FSH levels, disrupting the blood-testis barrier and spermatogenesis.Good
- Obesity induces chronic inflammation and oxidative stress in the reproductive tract, damaging sperm DNA and membrane lipids.Good
Related findings · Energy balance
- Achieving a total body weight loss of 10-15% (or >10-15 kg) through Total Diet Replacement (TDR) induces remission of Type 2 Diabetes in individuals with short-duration disease.Strong
- Bariatric surgery is superior to medical management alone for inducing significant long-term weight loss, remission of type 2 diabetes, and reduction in mortality for patients with BMI ≥ 40 or ≥ 35 with comorbidities.Strong
- Achieving type 2 diabetes remission requires significant weight loss (≥15 kg) via major caloric restriction, independent of macronutrient composition.Strong
This is one finding among thousands. Every one is graded and traced to its source, so you can see what the evidence actually supports. Browse the research →