Pesticides are toxins, "and I think there's good cause for worry about them," says Purdy. A new study in Food and Chemical Toxicology links pesticide-laced feed to tumors and early death in rats. Organic is ideal, but if that's not possible, pick produce with thick skins that peel off, because they're less likely to be contaminated. (Here's how to save money on organics.)
Fasting indeed has a long-standing spiritual tradition. "Almost every religion has some type of fasting ritual -- Lent, Ramadan, Yom Kippur ... the Hindus and Buddhists fast, too," says James Dillard, MD, assistant clinical professor at Columbia University College of Physicians and Surgeons in New York City. He's author of Alternative Medicinefor Dummies.