Can Hamsters Eat Bananas? Dead Hamster | Fotosdefrases. Can Hamsters Eat Bananas? House » Hamsters » Can Hamsters Eat Bananas? The answer is sure, hamsters can eat bananas. Bananas are a good source of dietary potassium and vitamin C, that are vital for hamsters. Hamsters are a well-liked pet and many individuals wish to know if they can eat bananas. However, an excessive amount of banana may cause weight gain in hamsters, so it is very important solely give them a small quantity as a snack.