Of course, not all foods are safe for hamsters. In fact, avocado, apple seeds, grapes, elderberry, mushrooms, onions, garlic, peach pits, chives, potatoes, eggplant, rhubarb and tomatoes are some of the foods that can be poisonous to hamsters.
Most of them will instinctively shy away from these foods, but it’s best to avoid them when feeding as well.