A new study has found that men who eat a healthy serving of walnuts every day will improve their sperm quality and boost fertility. The chemical in the walnut, omega-3, is also common in many other tree nuts. The researchers from the UCLA School of Nursing believe it is the omega-3 that provides the fertility boost. A previous study found that one in six couples is infertile, and that 40 percent of these cases were due to a male factor. Fortunately, walnuts can be found at many local supermarkets and convenient stores, as well as on the branches of the many walnut trees throughout the world, and they most likely cost less than going to a fertility clinic or taking medication.