A recent study found that eating walnuts can improve the quality of men's sperm. They're far from the only things that have been put forward — some more convincingly than others — as influences on men's fertility.
Good for sperm
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Walnuts
In the new study, researchers at UCLA recruited 117 healthy young men and gave walnuts to half of them for 12 weeks. At the end of that period, the walnut-eaters's sperm had better motility, while their sperm were also less likely to be malformed. A caveat: the study was partially funded by the California Walnut Commission, who also provided the walnuts.
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Leafy greens
A 2008 study found that men with diets high in folate — found in leafy greens and some fruits — had fewer sperm with the wrong number of chromosomes. Extra or missing chromosomes can cause a variety of congenital conditions, like Down's syndrome. Having lots of sperm with chromosome problems can also contribute to infertility.
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