Astronauts have breakfast, lunch and dinner every day when they are in space, and they can eat snacks if they feel hungry. They eat similar food to what we eat on Earth. The difference is that space scientists put the food in small packages to preserve it. In addition, they dehydrate drinks and keep them in powder form in special packages. It is more difficult to eat food in space because there is no gravity and the crumbs or small pieces of food can float away.