Except in the case of diseases or accidents, your dwarf hamster can live up to three years. But choosing the wrong food for him may shorten his lifespan. Not every fruit is healthy for your dwarf hamster. Some can make him sick and dying. Such should be kept out of his diet. Some examples of such fruits and vegetables are tomato leaves, raw potatoes, onions, oranges, and lemons. The last two fruits are too acidic for him.