Timeline: A History of Single-Food Diets
See also: Can man live on fruit alone? Read more about fruitarianism.
2010 Baby Food
The Diet: Fourteen servings of puréed carrots, peas, peaches, and more each day, plus a healthy dinner (think grilled fish and veggies), devised by celeb trainer Tracy Anderson.
The Die-hards: Reps for Anderson later deny she came up with the plan after it gets bad press.