8. Sweet Potato

Vegetables as a category may already be on the list, but this is one that’s worth calling out specifically because it’s so beneficial.

In Okinawa, Japan (a “Blue Zone” where many people regularly live to be over 100 in good health), sweet potatoes make up a full 60 percent of their total calories. Like many foods on this list, sweet potatoes are full of fiber and antioxidants, and they also have 400 percent of the vitamin A needed each day—an important nutrient that benefits the body’s immune system.