Dr. Oz is joined by registered dietician Kate Geagan to reveal the best fat-fighting food combinations. Learn which foods, when eaten together, help you lose weight fast!

Editor note: Kate Geagan accidently misspoke when mentioning her daily recommended dose of vitamin D. Vitamin D is measured in IU, not milligrams. The recommended dose is 1000 IU of vitamin D, not 1000 mg.

View Part 1 of Power Pairs to Melt Fat Faster.

Learn more about these dynamic duos and get Kate's avocado and orange recipes.

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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