Are your hormones to blame for your relationship squabbles? Dr. John Gray explains why men and women are so different. Learn about the new research that supports Dr. Gray’s claims.

Click here to read an excerpt from his book: Venus on Fire, Mars on Ice.

Click here to watch Part 1.

Click here to watch Part 3.

Dr. Oz goes where he's never gone before. He's letting you eat fast-food and it's not what you expect. Learn which fast food meals you can eat under 500 calories while still enjoying the food you love.