Dr. Mehmet Oz
Is your diet is harming your health? According to Dr. Joel Fuhrman, there is a certain way to eat in order to help maintain your waistline and your immune system. Dr. Oz talks to Dr. Fuhrman about his book Eat For Health: Lose Weight, Keep It Off, Look Younger, Live Longer and about the importance of eating certain foods to fight disease and stay slim permanently.

Many diets have poor nutritional value and therefore could be contributing to, instead of fighting off, various diseases, Dr. Fuhrman says. His diet plan focuses on foods that are rich in vitamins and nutritional density, keeping the body healthy and protecting against illness.

Dr. Fuhrman says his diet is successful because people are allowed to eat as much food as they want, as long as they are eating the right foods. "The key is not really to focus on the calories you are eating but [rather] on the quality of the food you eat—then there are mechanisms where the body produces fewer free radicals and the body feels comfortable eating less food," he says. "The symptoms between meals go away and you don't want to eat so many calories."

Avoid (but don't eliminate) animal products and eat lots of leafy greens and vegetables, Dr. Fuhrman says. By following that plan, Dr. Fuhrman says eventually the feelings that are commonly associated with diets—feeling light-headed, weak, foggy and shaky—go away and the weight begins to melt off. "When you eat healthfully, your body gravitates relatively rapidly toward a better weight," he says.

His diet plan avoids foods like butter, cheese and sausage, which are high in fat and don't provide proper nutritional value. Instead, he recommends consuming fruits like black raspberries, strawberries and blueberries, which he says provide benefits for every cell in your body. "When all these different categories of foods are mixed together...that's how you get true immune protection," Dr. Fuhrman says.