12. Sweet potatoes
One analysis found that sweet potatoes reduce HbA1c measures between 0.30 and 0.57 percent and fasting blood glucose by 10 to 15 points. Sweet potato also contains anthocyanins, which are the natural pigments that give the sweet potato its deep orange color and the antioxidants believed to have anti-inflammatory, antiviral, and antimicrobial qualities.
21. Red Onions
Don’t hold the onions – especially red ones. They not only add great color to salads, burgers, and sandwiches, but they also score higher in antioxidant power compared with their yellow and white cousins.Onions are also a good source of fiber, potassium, and folate – all good for heart health. Onions’ high flavonoid content also puts them on the map for cancer and cardiovascular research as well as other chronic diseases, such as asthma. According to a 2002 study in The American Journal of Clinical Nutrition, having a high dietary intake of the flavonoid quercetin found in onions may lower the risk of these chronic illnesses.