I'm not familiar with the Diet 4 Idiots, but I am familiar with loosing nearly 40 pounds (and keeping it off)! My youngest is now 11, when I was pregnant I was easily over 225lbs, and when he was about 2yo, I went on a sensible program that recommends eating regular meals that include protein, fat, and healthy carbohydrates(like vegetables), with exercise, and lost 40lbs and have kept it off for 9 years (I now weigh 160lb, I know I could/should loose more, but at least now I am comfortable with my body).
Most weight loss programs only have a long-term success rate, where you keep the weight off, of 1%. If you only have a 1% chance of not just meeting your goal, but keeping it off, why spend money and time only to be disappointed?
Eating sensibly and exercise are your best bet, yet we all need friendly reminders of this, and that is why personal fitness and nutrition coaches, like my friend Kathy Jordan, of "body transformation by kj" are so helpful. Find a friend or buddy to exercise with, and make dinner time easy on yourself by utilizing a meal assembly store like Dream Dinners. Most of their meals on about 290 calories per serving, with less than 10 grams of fat. When you have dinner already waiting for you at home, you're less likely to resort to going out as often, and we tend to eat better, more nutritious meals, when we sit down at home, turn off the t.v. and focus on our family. Eat well to be well :-)