1, the most taboo in eating in space is to talk while eating, which will make the broken food in your mouth fly out of your mouth and float into the restaurant or living room. Astronauts are easily suffocated by their lungs if they accidentally inhale into the nasal cavity.
When drinking water, if you use an ordinary cup, even if the cup is turned upside down, the water will not flow downwards. Because in a spaceship, water loses its weight. Astronauts must use plastic cups with straws if they want to drink water.
Don't cry casually in the space, because the tears won't fall. They will form big bubbles with bubbles, and even if you squeeze them with your eyes, they will stick to your eyes. Luca Parmitano, an astronaut who is working outside the cabin, has a problem with his spacesuit and leaks water. In fact, there was not much water leakage, but because of weightlessness, he almost drowned in his overalls.
After entering space, most people have to "grow taller" by several centimeters. In fact, the bones are unfolded in microgravity, and there is no gravity to press the bones to elongate, especially the lumbar vertebrae. Those who have stayed in the International Space Station for a long time even have a gap of about 5 cm. Although returning to the ground will pay a lot, it is basically a little higher.