Beyonce went on one to slim down in a sizzle for her role in Dreamgirls. Gwyneth Paltrow swears by them. Even Sarah Jessica Parker engages in one from time to time. What, you ask? The infamous celebrity-hailed "detox" in which you drink mysterious, liquidy concoctions to "flush toxins" out of your body.

Dr. Ian Smith has got news for you: they don't work! Watch this video from a segment on Today's Health to find out why and score a better alternative.