I presume to save weight (the food not the astronaut) and space. Every ounce requires a tremendous energy and expense to lift into orbit and stowage space is at a premium.
Astronauts eat dried food, or, really really well packed food. They pack food really really good by sucking out all of the air inside the package. When they eat the dry food, they add water through a little tube.
They eat freeze dried food, which is basically real food that has had all the water evaporated out of it, this way it takes up less space when they pack it ( they have to put water on it when they eat it so it goes back to regular size)
If plants were to grow on Mars the proper artificial environment would have to be created by a colony and they could grow just about anything they chose. I would imagine it would be plants that would provide food for the colony.
astronauts eat normal food in space. Almost all food is dried for less weight. Water is added to package before heating food. Astronauts have to hold food, so that it doesn't fly away. Knives and Forks are magnetized to the tray, so that it doesn't fly away.
In their suit is a toilet sorta thing.
They eat freeze dried food.
Astronauts eat freeze dried food
Dried banana is a nutritious food for birds. But probably the real reason why birds eat dried bananas is that we feed them dried bananas. If we fed them something else, they would eat that instead.
They eat dried up food in a plastic bag
Dried food most likely
fish dried barriers
They eat dried marine flake food and frozen mysis shrimp
they can eat food from the pet store but they wont eat the dried corn also hay that rabbits eat
Mostly astronauts will have freezed - dried foods. Astronauts will squeeze water into food packages and then eat the food after it absorbs water.
Astronuts have to be tied to their beds at night to stop them from floating!
their diet is mostly freeze dried food in space but on earth they can eat regular and have to exercise regularily
The medka fish will eat dried and flaked fish food. They will also eat freeze-dried fish foods. They are found in rice patties throughout Asia.