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There is no filler in Harry Hamster or most good quality hamster food, sometimes the vitamins are added to the pellets or biscuit pieces so you can't really throw anything away without altering the nutritional value.
How often do you feed & do you refill the bowl before all the food has gone?
It's not really a problem is they leave the odd bit but if you give more food before most of it has been eaten then they can get picky & just wait for the tastiest bits!