Certain fruits help lower cholesterol naturally and support heart health, according to Zhaoping Li, a nutritionist and professor of medicine at the University of California. Pears and apples help lower cholesterol, she says. These fruits are low in calories and free of fat and sodium. The fiber they contain helps protect the heart by normalizing blood pressure. Avocados are very fatty, but they can be just as healthy: scientists have found that eating one avocado every day stabilizes low-density lipoprotein levels. Grapes are another unexpectedly healthy product that has a positive effect on intestinal bacteria. According to a nutritionist, it is also beneficial to consume watermelon, which contains citrulline and an amino acid that increases nitric oxide levels in the human body.