Many diet plans rely on meal-replacement shakes, bars or other snack type foods, while others rely on frozen entrees as a major part of your diet, like Medifast and Nutrisystem. Ask yourself if you want the bulk of your diet relying on prepackaged snacks, shakes or frozen meals, or if you prefer the flexibility of cooking your own meals or eating out frequently.
Eat Breakfast Every Day. One habit that's common to many people who have lost weight and kept it off is eating breakfast every day. "Many people think skipping breakfast is a great way to cut calories, but they usually end up eating more throughout the day, says Elizabeth Ward, MS, RD, author of The Pocket Idiot's Guide to the New Food Pyramids. "Studies show people who eat breakfast have lower BMIs than breakfast-skippers and perform better, whether at school or in the boardroom." Try a bowl of whole-grain cereal topped with fruit and low-fat dairy for a quick and nutritious start to your day.