Award-winning science writer Gary Taubes disagrees with the medical community’s most basic rules of dieting. Here, Gary challenges Dr. Oz to reexamine his fundamental assumptions about nutrition and why we gain and lose weight.

Click here to see Dr. Oz and Gary Taubes debate the effectiveness of exercise for weight loss.


Click here to read an excerpt from Gary’s book, Why We Get Fat.


Click here to watch Part 1.

Click here to watch Part 2.

Want to help lower your risk of getting cancer? The answer could be in the food you eat! Dr. John Whyte, chief medical officer at WebMD and the author of "Take Control of Your Cancer Risk," says there are three kinds of foods that could really help prevent cancer: garlic, fish and grapes. And what three kinds of foods should you avoid? Red and processed meats, refined grains, and alcoholic and sugary drinks. Watch the videos below to learn more about how food could be connected to your cancer risk.