The difference is that space scientists put the food in small packages to preserve it.
Astronauts have breakfast, lunch and dinner every day when they are in space, and they can eat snacks if they feel hungry.
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.
They eat similar food to what we eat on Earth.
In addition, they dehydrate drinks and keep them in powder form in special packages.