I can eat a small snack and not be hungry for the rest of the day. i was wondering if there is a problem with my appetite?

Appetite: Different people have different metabolisms and have different requirements. If you have no other symptoms I would not worry. If you increase your calorie output by, for instance ,exercise I think your desire for more food would increase

Maybe.: Some might say there is a problem, but if you are not hungry, you are at a good weight for your height and your weight is stable you are eating enough. Question might be if you are eating a good balance of things to include proteins / minerals and vitamins.