In Icaria, Greece, 1 in 3 people lives to the age of 90, making the Greek island one of the areas designated as a "blue zone," where people enjoy superior longevity. There are also no cases Alzheimer's disease reported there despite many people living to a ripe old age. One of the nourishing foods they enjoy are mustard greens. High in vitamin K (most Americans are deficient in this nutrient), the spicy greens are good for your blood and bone strength. Try them as the Icarians do: boil and then toss with a little virgin olive oil and lemon.