Carrots in particular were singled out for their sperm-boosting properties. These orange veggies, along with lettuce and spinach, are high in beta-carotene.
Researchers found that this antioxidant improves sperm motility, or its ability to swim toward an egg, by 6.5 percent to 8 percent.
Lutein, a carotenoid or antioxidant also found in spinach and lettuce, had a similar effect on sperm motility, researchers said.
The participants with diets rich in lycopene, the chemical that gives tomatoes their red color, had lower levels of abnormally shaped sperm.
The study is published in the journal Fertility and Sterility.