CBS News reports that several studies presented at the American Society for Reproductive Medicine’s annual meeting this week and published in Fertility and Sterility have identified habits that may affect male fertility. The first study examined 156 men and surveyed their eating habits. They found that men who ate the most fish had high sperm counts, whereas men who ate large amounts of processed red meats had poor sperm morphology. A second study examined the connection between caffeine and alcohol consumption and found that there was actually no effect on sperm count or motility. In a third study, scientists divided men into 4 groups depending on the amount of exercise in which they engaged. The findings showed that men who engaged in highly vigorous activity, specifically weightlifting, had the highest sperm counts. Researchers believe that these results are connected to testosterone levels and insulin sensitivity changes that result from diet and exercise.