3 Days of Fruit?

My grandma gave me this article about the importance of eating fruit and what it can do for your body. What's funny is that there are tons of pills on the market for colon cleansing. According to this article she gave me by a Dr.'s name that I can't remember if you eat nothing but fruit for 3 days it will cleanse you. I wonder if it works? I'll keep you posted. I can't imagine eating nothing but fruit for 3 days. I would have to have a wide variety!