Diets high in saturated fat are bad for waistlines, but they can also have a negative impact below the waist. They may lower sperm count and sperm concentration, according to a new study published in the journal Human Reproduction.
Researchers from Massachusetts General Hospital, Brigham and Women's Hospital and Harvard Medical School collected semen samples from 99 mostly overweight or obese men and assessed their diets by asking them how often over the previous year they had certain foods and beverages.
They found that eating a lot of saturated fat was associated with a lower total sperm count and concentration. Diets high in omega-3 polyunsaturated fats -- the fats commonly found in fish and plant oils -- were associated with better-quality semen, meaning the sperm cells were of a better size and shape. The study did not determine what particular kinds of saturated fats were linked to sperm count.
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