Longevity isn’t just about exercising, it’s also about choosing the right diet. See the five foods that help you boost immunity, fight cancer and increase longevity. Plus, why mushrooms must be cooked.

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Click here for Dr. Weil's food pyramid and click here for more on these foods.

Fat Substitutes: Could They Be Leading to Your Weight Gain?

They're hiding in everything from low-fat cottage cheese to protein shakes.

Fat substitutes are compounds that resemble the chemical and physical properties of certain fats and oils and are often used to replace conventional fats (butter, oil) in baking and frying. They can help bring calorie counts down.

But fat substitutes are almost like secret ingredients that hide in plain sight, says Mark Schatzker, author of the upcoming book "The End of Craving: Recovering the Lost Wisdom of Eating Well."

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