It's the little things that add up. That goes for snacks too. One here, another there, and the next thing you know you've added 500 extra calories to your daily value. The key isn't avoiding snacks, but keeping their calorie counts in check—ideally to less than 150 calories each. This way, you can still incorporate tide-me-overs in between meals while, at the same time, achieving your weight-loss or maintenance goals. Snack smarter with these low-calorie, high-nutrient nibbles.