*The Biggest Loser* trainer Bob Harper says the first step to slimming down, as he describes in his book *The Skinny Rules,* is to simply read food labels. "People don't realize how many calories they're eating, how much protein, fat," he says. "What's a serving size? People think that if this says it's 190 calories I can eat the whole thing, well, you have to see how many servings are in whatever it is you're eating and then multiply that number." He and Rachael are showing you some common additives you'll find in foods so you know what you're eating — watch the video for these tips!