Macaroni and cheese.

It's an all-time favorite comfort food for both kids and adults, but it can wreak havoc with your diet. A 12-ounce serving of Stouffer's macaroni and cheese has 529 calories, 25.7 grams of fat, and 10.6 grams of saturated fat. Calories can climb higher when ingredients like high-fat meats or sausage are tossed in. And some restaurants even sell deep-fried mac and cheese as an appetizer! Your best bet when eating out is simply to find another side dish. At home, "modify the recipe by using a low-fat cheese, low-fat milk, and stretch it with additional vegetables to improve the nutritional profile and still taste great," says Liz Weiss, author of The Mom's Guide to Meal Makeovers.