Here are some great, healthy snacks that are under 200 calories and help you feel "full" and burn fat!  The key is to combine a little bit of fat, protein and carbohydrates for optimal "fullness".  Fiber is also IMPORTANT.
1.  Hummus with veggies (carrots, celery, bell peppers, etc), pita chips, or high-fiber crackers
2.  Cottage cheese with fruit (pineapple, peaches, pears are best)
3.  Protein shake (1/2 scoop of protein powder blended with ice, non-fat plain yogurt or milk, and mixed berries)
4.  2 slices of beef jerky and a clementine/orange
4.  String cheese and an apple (or handful of grapes)
5.  Yogurt parfait (layer non-fat plain yogurt, low-fat granola, and mixed berries)
6.  Apple slices, banana, or celery sticks w/ low-fat peanut butter (watch portion control)
7.  Ranch or other dip mixed with cottage cheese (instead of sour cream) and high-fiber crackers, pita chips, or veggies (watch portion control)
8.  Luna bar (I like these ones because they are a perfect combo of protein, carbs, and fat, they're under 200 cal, and they TASTE GOOD!!!)
9.  1/2 bagel (or mini bagel) with cottage cheese, tomato slices, and pepper
10.  Turkey or other lean deli meat and piece of fruit