Alcohol

Consuming alcohol of more than one or two drinks per day can affect the quality and quantity of sperm, lower testosterone levels, and contribute to impotence. A 1996 research study from Finland showed that moderate alcohol consumption can kill off some sperm-producing cells within the testicles and also may cause abnormal sperm shapes. A normally shaped sperm should resemble a streamlined tadpole with an oval head and long tail. Abnormally shaped sperm vary in appearance and may have two tails, a tapered head, a crooked kinky shape, or an unusually large or small head. Any of these abnormalities make it so that the sperm is unable to penetrate the surface of the egg and therefore unable to successfully fertilize the egg. Men who partake in heavy alcohol consumption—that is, more than six drinks per day—are more likely to suffer from low sperm count, poor sperm motility, and abnormal sperm shape.

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