Reproductive health is not for women only. What can men do? According to the Berkeley Wellness Letter June 2013, men under 35 could benefit from eating 2.5 ounces of walnuts a day, while men over 44 may find it helpful to eat a high antioxidant diet rich in vitamins C and E and zinc. Studies also suggest that moderate physical activity is good for the sperm quality in men of all ages. Sounds simple enough!