Some foods may appear healthy -- low in calories, fat or cholesterol -- when in fact they may contribute to weight gain or prevent weight loss. The top 10 to watch out for:

1. Non-diet soda: Loaded with sugar and (in many cases) caffeine. One 12-ounce can has 150 calories and 10 teaspoons of sugar. Another problem: Many young women miss valuable calcium by choosing soda over milk.

2. High-Sugar Cereals: One bowl of low-grain, high-sugar cereal -- made mostly of white flour, sugar and food coloring -- can have as much sugar as two Reese's Peanut Butter Cups. Also, these cereals usually offer very little fiber.

3. Frozen potato products: The potato is the most popular vegetable in America. Problem is, the frozen varieties are often high-fat, high-salt and heavily processed spuds. Opt for fresh, whole potatoes, baked and topped with nonfat sour cream.

4. Deli meats: Unless you buy roasted turkey breast, ham or roast beef "carved from the bone," your sandwich staple may be loaded with fillers, salt, preservatives and food coloring.

5. Salad dressing: Salads can be excellent, healthy meals -- but not if you top them with high-fat dressing. Buy low-fat or nonfat dressings or risk drowning your lettuce and veggies in up to 20 grams of artery-clogging fat (per 2-tablespoon serving).