Fill up on low fat foods like fruit, nuts, or beef jerky.
Nuts are high in calories, but these are mostly derived from healthy unsaturated and not saturated fats. Fruit can be high in sugar, but eating it alongside a high protein buffer, such as beef jerky, helps to slow the release of Insulin and keep your blood sugar balanced. This also keeps you in a good mood.
Just go easy on the portions. 
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