"A lot of calories, but they're not a lot of nutrients," Dr. Oz says. "When your brain doesn't get the nutrients that it wants—because it can tell the difference between calories and nutrients—then it says, 'Hey, guys, feed me.' You're going to keep eating more food until you get the nutrients that your body desires."
Watch Dr. Oz analyze a food label.
The first step to taking charge of your health, he says, is not to fall for "the head fake" on food labels. Check how many serving sizes are in the package. For example, if a box of instant macaroni and cheese says it contains two servings, if you eat the entire box you have to double all of the nutritional numbers.