Answer Hi Taylor, There is a wide variety of fruits and vegetables you can feed your hamster. However, you'll need to start slow. (Feeding your hamster too many fruits and vegetables, too soon, can give him diarrhea.) Begin by giving your hamster a small piece of fruit or vegetable 2 or 3 times per week. After about 4 weeks or so, gradually increase the amount, so that you are feeding him a small piece of fruit or vegetable 6-7 times per week.