And for the most part, they can if you stick to the plan. But the theories behind these different diets vary greatly. So here's what you're in for, depending on what you choose. We got this from Time magazine.
The Atkin's Diet: The claim is that low carbohydrate levels will force your body to burn fat for energy. Bottom line short-term studies show that the diet DOES lead to weight loss, but one man recently sued the Atkin's estate claming it caused clogged arteries that required him to get surgery.
Dr. Phil's Ultimate Weight-loss Solution: The claim is that if you change your thinking and your attitude - and eat "high-yield" foods you'll also change your weight. Essentially, the diet plan is low-calorie, high protein. It's sound advice, but a little over-simplified. And there's no legitimate proof that the supplements Dr. Phil promotes are effective. Also, not all overweight people eat emotionally, so simply changing their attitude won't cut it.
And a final diet rundown: The Maker's Diet. This book offers common sense from "masters" who have lost 20 pounds or more and kept the weight off for at least 3 years. There aren't any specific rules, but they favor low-fat eating, regular mealtimes, food journaling, realistic goals and exercise. The bottom line is that you can do things your own way, but follow the golden rule - burn more calories than you consume.