How do astronauts eat, when they're in space

1. How do astronauts eat, when they're in space
2.How do they go to the restroom?
3. How long are they typically in space?
4. What has the longest expedition, and how long was it?
5. How impaired is an astronaut, when he comes back from space, having not used his muscles?

1. Astronauts on the International Space Station eat food in much the same way as they do here on Earth. In a micro gravity environment, food and drinks would simply float away if they weren't handled correctly. To combat this problem, food is carefully contained and drinks are packaged as dehydrated powders. The astronauts add water to beverages through a special tube before drinking. Foods are either partially or completely dehydrated to prevent them from spoiling. Meats are exposed to radiation before they are put onboard the shuttle to give them a longer shelf life.

2. Each spacecraft comes equipped with a unisex toilet. Although the toilet itself looks like a slightly higher-tech version of its counterparts here on Earth, it's designed a bit differently. The toilet consists of a commode that holds solid wastes and a urinal for liquid wastes. A funnel that fits over the genital area allows both men and women to urinate standing up, although they also have the option of sitting down. To prevent the astronauts from floating away in t­h­e weightless environment, the toilet comes equipped with foot restraints (for sitting) and a toe bar to slip the feet under (for standing). The toilet also has a thigh bar similar to the one that pulls down over your lap when you ride a roller coaster and fabric fasteners that go around the thighs. To ensure that the waste also doesn't float around, the toilet uses flowing air instead of water to flush the toilet. The air pulls the waste away from the astronaut's body and flushes it away. After the air is filtered to remove bacteria and odors, it's returned to the living cabin.