Lifestyle and fertility: the influence of stress and quality of life on male fertility.

Plain-language summary

This review pulled together what is known about how everyday life affects a man's fertility, covering age, psychological stress, nutrition, physical activity, caffeine, scrotal temperature, hot water and mobile phone use. Its central claim is about stress: across studies of men under occupational pressure, men living through wars and earthquakes, and men in couples struggling to conceive, semen quality was consistently worse. Heat is the other half of the argument. Raised scrotal temperature (from hot baths, prolonged sitting, tight clothing or a hot working environment) impairs sperm production, because the testicles sit outside the body precisely so they can run cooler than it does. The authors conclude with a package: education, changes to the working environment, better nutrition, appropriate exercise, psychological support, and antioxidant supplements. They do not say which antioxidants or at what dose, and the largest trial evidence in this library found no supplement improved the odds of a pregnancy or a live birth, so treat that last item as the weakest part of the package. This is a narrative review rather than a pooled analysis, so it reports directions, not sizes.

Key findings

• Psychological stress (occupational, from major life events, or from infertility itself) was consistently linked to worse semen quality across the studies reviewed.
• Raised scrotal temperature, from hot baths, prolonged sitting, tight clothing or hot work, impairs sperm production.
• Age, nutrition, physical activity, caffeine and mobile phone use were all identified as modifiable influences on semen quality.
• The authors recommend antioxidant supplements as part of a broader lifestyle package, without naming which ones or at what dose.