Hamsters aren't picky and will eat just about anything you give them. However, there are some foods you should avoid. Never give them citrus fruit such as oranges, lemons, etc. Also, too much lettuce and leafy greens should be avoided as it can give hammie diarrhea. I mostly just feed Buttercup and Cupcake on special hamster food which has everything she needs and I get it at "Pet Supplies Plus". I fill her dish and put it in her cage until she needs more and then feed her again. However, hamsters always enjoy a little treat now and then so go to treats for some great recipes for hammie.

some good foods for hamsters:
sprouts
dandelion leaves
corn on a cob (for them to gnaw on)
meat
sunflower Seeds
potato--cooked or raw
apple
carrot
grapes
berries
bread
cooked fish
boiled rice
pasta
lettuce--not too much
meadow hay
cauliflower
tomatoes
banana
dog biscuits
eggs
cottage cheese
yogurt
chicken
berries