Artificial sweeteners affect more than just your waistline – they can also change what happens in the bathroom. Dr. Oz explains why certain sugar substitutes cause diarrhea and how you’re wearing out your bladder by drinking diet soda.

View Part 1 of The Problems Artificial Sweeteners Cause in the Bathroom.

See Dr. Oz’s investigation into the dangers of artificial sweeteners.

Watch Dr. Oz explain how you can cut back on artificial sweeteners.

Learn more about the dangers of food substitutes.

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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