Researchers from Massachusetts General Hospital and Harvard Medical School collected semen samples from 99 men who were overweight or obese. They also examined the dietary habits of these men. In the process they discovered that a diet high in saturated fat was linked with lower sperm count and concentration.
They also found that diets high in omega-3 polyunsaturated fats, which are in fish and plant oils, were associated with better-quality semen. Basically, the sperm cells were a better size and shape.
This is the first report to link specific dietary fats with semen quality.
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