Kiwi
A study from Rutgers University compared 27 of the most popular fruits, determining that the kiwi is the most nutritionally dense of them all. One tangy-sweet kiwi supplies a full day’s dose of vitamin C, plus good amounts of potassium, a mineral linked with healthy blood pressure. Plus, kiwi contains more vitamin E, an antioxidant, and more lutein, a nutrient connected with protecting your vision, than almost every other fruit or vegetable—for only 50 calories. Enjoy a kiwi unadorned: simply cut it in half and scoop with a spoon.