Ayoob: "This is the original 'Full-Fat Diet.' Isn't America over this one yet? For people who plan to ditch their resolutions, this diet is for them -- people don't tend to stay with it very long. Just understand that when you finally let go of this diet, you'll have to go for something more realistic and not so limiting. Why not do that right from the start?"
What It Is: In its purest form, the Mediterranean diet is designed to emulate the food choices of those who live in areas on the Mediterranean Sea, such as in Italy and Southern France. A true Mediterranean diet is predominantly plant-based, with plenty of fruits and vegetables, grains, beans, nuts, seeds and olive oil. It also incorporates some cheese, yogurt, fresh fish and poultry, with very little red meat.
Most nutrition experts caution that the Italian fare served at many Italian restaurants in the U.S. -- which is heavy in cheese, meat and fat -- should not be confused with a Mediterranean diet.
Ayoob: "This diet is famous for olive oil. Olive oil is great and it's heart-healthy, but it has as many calories as any other oil, even the less healthy ones. As such, the more olive oil you eat, the smaller your other portions are going to be. It's true that fat helps you feel satisfied, and this diet also focuses on lots of fruits and veggies, but it can be a little low in calcium, as dairy is not a huge part of the Mediterranean diet. I'd modify it to include low-fat milk."
Ikeda: "In looking at the [figures] below, one has to conclude that eating the way the French and Italians do might be quite beneficial."
Percentage of people classified as obese:
USA: Female = 34 percent; Male = 27.7 percent
Italy: Female = 9.9 percent; Male = 9.5 percent
France: Female = 7.0 percent; Male = 8.0 percent
What It Is: While there is no single Detox diet, all are built around the idea that, by eating or avoiding certain foods, you can cleanse -- or "detoxify" -- your body. The toxins that are purportedly eliminated from the body through these diets are most often identified as chemical pollutants from the environment, along with supposedly harmful byproducts of human metabolism that linger in the body's tissues. Most Detox diets are intended to be temporary, lasting a few days or a couple of weeks.
Detox diets also provide a constant source of fodder for celebrity magazines, as stars including Gwyneth Paltrow, Angelina Jolie and Beyonce Knowles have reportedly tried them in the past.
Katz: "All Detox diets are rather silly. The body detoxes itself just fine. No real 'there' there."
Ikeda: "Doesn't anyone remember the lessons in human anatomy and how the body functions that were taught in elementary, middle school, and high school? Well, if one did remember, then one would realize that the body is self-cleansing -- like a self-cleansing oven. We get rid of 'toxins' daily in urine, feces, and sweat. If we didn't, we would be dead in a matter of days."