Alcohol use Lifestyle factors, such as substance use or adiposity, can play a detrimental role in the quality of the semen. One study examining the consequences of alcohol consumption and its effect on semen quality concluded that alcohol intake can lead to a negative effect on semen volume in daily alcohol consumers. However, occasional or moderate use of alcohol was observed to not have an adverse effect on the semen.
Body mass index (BMI) A
body mass index (BMI) level not within normal range can also affect semen quality negatively. Being underweight, presented by a low BMI value, was observed in an analysis to decrease the total sperm count and semen volume. No significant changes were observed in sperm concentration and motility due to a low BMI. However, due to the lack of raw data, further research is needed to clarify the role of BMI in semen quality. On the other hand, an overweight (BMI of 25.9–29.9) or obese status (BMI over 30) is similarly associated with low semen quality through a decrease of semen volume, concentration, motility, count, and morphology. Alteration of sex hormone levels were also concluded to result from a high BMI status, with affected hormones such as
inhibin B or
testosterone observed to decrease in concentration, whereas estradiol was increased. The reduction in hormone levels can subsequently result in being diagnosed with hypogonadism.
Trace minerals An inadequate level of essential
trace minerals in the body can further compromise semen quality. A significantly lower
zinc plasma concentration value within the semen was observed in infertile males. Supplementation with zinc could benefit sperm quality by increasing the semen volume and improving sperm motility and morphology. In addition to zinc, nutritional deficiencies or excess intake of
selenium is also associated with impaired semen quality. However, in moderate levels, the antioxidant properties of selenium, likely due to an increase in
glutathione peroxidase-1 activity (enzyme protecting from oxidative damage) and reduction of reactive oxygen species (
ROS) production, may be recommended for supplementation. According to a review, higher consumers of
cola showed a statistically significant decrease in semen volume. The high starch levels in potatoes promotes
oxidative stress along with risk of inflammation from a resulting high glycemic index. Meanwhile, processed meats can possibly contain
xenoestrogens and may compromise semen quality. However, additional research is warranted prior to recommending a set dietary regimen in regard to improving sperm parameters. Currently, the only general recommendation that can be made is to adhere to a healthy dietary pattern such as the
DASH diet or
Mediterranean diet. As low density of the sperm population is usually associated with infertility, hypospermia becomes an infertility issue when one is also identified to have oligospermia. Further semen analysis may be needed prior to being identified as oligospermic. When a semen analysis does indicate abnormal results, lifestyle factors recommendations prior to a new semen sample include a nutritional diet, as well as limitations on smoking and alcohol use. A cold bath and removal of tight-fitted underwear apparel may also be recommended within the month prior to re-examination. == Etiological testing ==