Can Hamsters Eat Bananas? Hamster Banana - How to care Cute Hamster Baby blog 5685. Can Hamsters Eat Bananas? Residence » Hamsters » Can Hamsters Eat Bananas? The reply is yes, hamsters can eat bananas. Bananas are a very good supply of dietary potassium and vitamin C, that are vital for hamsters. Hamsters are a popular pet and many people wish to know if they'll eat bananas. However, too much banana can cause weight gain in hamsters, so you will need to only give them a small quantity as a snack.