Hamster can be picky eaters, they tend to pick out certain parts of their food. For example: in the food I feed my hamster they have tiny tan pellets. None of my three eat it. I've tried it and I'm not too fond of it. Most hamsters love sunflower seeds! I feed my hamsters: KAYTEE Fiesta. They seem to like it and I recommend it. Also if you go to your local pet store, or a regular store, they will have hamster food. Some stores have it, but not all. Prices range for size, brands, etc. I would get the bag that has vitamins. It's good for your hamster and their immune system. If your hamster seems to have issues with the food, you should go to a vet and see what's best! Not all food is the same, and not all hamster's stomach is the same. Also you can feed your have some fruit and veggies as a treat. They still need food, but they like fruit and veggies too. You cannot feed them iceberg lettuce!! It's too watery and will get them sick! Instead, you can feed them kale. Hamsters can't have fruits with seeds. They like banana's, carrots, small pieces of celery, and romaine lettuce. They can also have treats that you can buy from your local pet store or store. For a longer list of food they can eat go to:
http://www.southernhamsterclub.co.uk/new/index.php?option=com_content&view=article&id=56&Itemid=71
http://www.southernhamsterclub.co.uk/new/index.php?option=com_content&view=article&id=56&Itemid=71