What "healthy" and "get in shape" are depends on your goals.
Are you trying to lose fat, put on muscle mass, get in better shape cardiovascularly, get stronger, what body type are you, etc etc etc....
For simply trying to lose weight, its often as simple as calories in must be less than calories out. So any snacks you have must be low in calories. Vegetables have virtually no calories in them. Fruit has some, lean meat has some, and obviously foods like potato chips, non-diet pop, and pastries have a lot.
A major factor in weight loss is also hydration. You cannot lose weight without being properly hydrated. The biochemical breakdown of fat requires a lot of water.
Some good suggestions in this thread though. Nuts, beef jerky, and lean turkey will provide you with protein and few calories. Studies show that this will decrease your appetite while simultaneously increasing your metabolism.
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