TODAY: Does Weight Watchers work?

Weight Watchers is the next diet program to be probed in the TODAY show's series, "TODAY Investigates Diet Programs." Karen is a working mom with one child and her own small business. Her goal is to drop 18 pounds in 3-months using Weight Watchers. Karen is given 24 points per day during the 3-months. Here is the mathematical formula WW uses to calculate points: Where: p = Points c = Calories f = Fat Grams r = Dietary fiber Grams (Note: min{r, 4} equals the number of grams of dietary