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Fertility doctors at Harvard and Murcia University have some unequivocally bad news for young men: they may have to choose between sweets and fertility, according to The Sun (via My Fox New York).

A joint study between the American and Spanish universities concluded that men who ate a high quantity of junk food had weaker sperm, which less likely to fertilize their partner's egg.

According to the study, even if the men, ages 18-22, exercised and were in good shape, the poor diet was enough to doom their sperm to infertility.

Men with a diet that included trans fat had the worst sperm, while men with eating habits that incorporated whole grains, fish and vegetables scored the highest quality.