Ignore fad/crash diets. Stick to 1,000-1,200 calories a day. Limit carbs and consume your goal weight in protein. Exercise for at least an hour alternating strength and cardio. Drink plenty of water. And don't have "treats" for being good. Thats a major diet buster. You're not a dog in training, food is not a reward. Eat to live *only*.
Dansinger recommends eating a diet that minimizes starches, added sugars, and animal fat from meat and dairy foods. For rapid weight loss, he recommends focusing on fruits, veggies, egg whites, soy products, skinless poultry breasts, fish, shellfish, nonfat dairy foods, and 95% lean meat.