Hello, it is completely feasible in theory. As long as the human body can get the energy it needs to run, it can't be achieved with the current technology. The astronaut experimental food developed by NASA can make a biscuit contain the nutrients people need for a day. In theory, people can support hunger strike by intravenous injection without eating. It is said that experts in Tibetan Buddhism and yoga can meditate without drinking or eating for decades, and science has also confirmed that a yogi can absorb urine twice through the bladder. I hope you can adopt it.