Can Hamsters Eat Bananas? Big Hamster | Cavandoragh. Can Hamsters Eat Bananas? House » Hamsters » Can Hamsters Eat Bananas? The reply is yes, hamsters can eat bananas. Bananas are a superb supply of dietary potassium and vitamin C, that are vital for hamsters. Hamsters are a well-liked pet and many people wish to know if they will eat bananas. Nonetheless, an excessive amount of banana can cause weight acquire in hamsters, so you will need to only give them a small amount as a snack.