Your tamagotchi won't always eat Meals. You should try feeding it snacks. If you make your tamagotchi very skinny, they will refuse to play games, so feed it some snacks. Tamagotchi's will always eat snacks.
Yes as Locky458 said they don't always eat meals but they will always eat snacks atleast utill it get a toothach then just give it some medicine and do it again that is what I do so I can play games to get points....