A study of 99 men attending a US fertility clinic found that a diet high in saturated fat has been linked with a reduced sperm count. They also found that those eating rubbish food diets had poorer sperm quality. The group, led by Prof Jill Attaman from Harvard Medical School in Boston, questioned men concerning their diet and analyzed sperm samples over the course of four years.
Men consuming the most omega-3 fatty acids had sperm with a more normal structure than men with the lowest intake. The magnitude of the connection is relatively dramatic and provides additional support for the health efforts to limit consumption of saturated fat given their relation with other health outcomes such as cardiovascular disease.