Apples
Ever heard the saying, an apple a day keeps the doctor away? Well, it just might. Apples contain a flavonol called quercetin. This flavonol has been associated with the reduced risk of stroke and heart disease and the reduction of blood pressure in hypertensive people. Clinical trials have been done and they suggest that quercetin might help treat cancer and other diseases, although more research has to be done. Quercetin is also found in other foods like berries, red onions and kale.