Fruit does offer plenty of benefits, so there's no need to give up your favorite berries or melons. Research suggests that fruit may reduce the risk of cancer and other chronic diseases, and it's also a good source of fiber and naturally filling. The key is moderation. Stick to two cups or two pieces of fruit each day, says registered dietitian Dawn Jackson Blatner, author of The Flexitarian Diet.
Meanwhile, the Woodstock Fruit Festival—a weeklong event in August—has extended an open invite to Kutcher. "As far as I know, from my extensive experience in the fruitarian community, no one has died or come down with an illness related to a fruit diet,"Arnstein says. "We'd really like Ashton to consider coming." The festival, which is in its third year, has seen significant growth, and more than 700 fruitarians are expected to attend this year.
While the debate will undoubtedly rage on, experts warn that the fruitarian diet is simply too extreme. "There is no one magic bullet—no magic food or food group that will keep us healthy," Jackson Blatner says. "Variety is more than the spice of life. It's the basis of optimal health."