You're craving salt
Opt for a plain bag of potato chips—not the flavored kinds like sour cream and onion—that lists just potatoes, oil and salt as its ingredients. Why? Artificial additives come with extra (bloat-causing) sodium.

Calories per 1 1/8-oz. bag 180

You want to be healthy
Most "fruit" snacks are actually fruit-flavored—meaning they're packed with unnutritious sugar and artificial coloring. Try trail mix (270 calories) instead.

Calories per 2-oz. bag 270

You're on a low-carb diet
Pick peanuts or cashews. This bag has just 9 grams of carbs; in contrast, a bag of pretzels has 46! Just watch portion size, as nuts are highly caloric.

Calories per 2-oz. bag 330

You skipped breakfast
Protein bars are too high in sugar, says Nestle. Try a granola bar, which balances out its sugar with 2 grams of fiber.

Calories per package 180

You need chocolate!
A Hershey's bar with almonds is a splurge, but at least there are no fillings like nougat, which add sugar and calories, and the nuts are good for you.

Calories per 2.1-oz. bar 320

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The Hidden Danger in Snack Food
Before you down an entire bag of any snack, read the number of servings first, as it may contain two or even three servings. "The whole [problem] with junk food is portion size," says nutritionist Marion Nestle, who recommends sticking to snacks that make up no more than 10 percent of your daily calories (so, 180 calories for an 1,800-calorie-a-day diet).