If you are simply talking about “bare minimum to survive”, then the answer is they can, but it is EXTREMELY dangerous.
You technically don’t need anything to survive besides your own body fat, electrolytes, and water; but a multivitamin that hits the daily recommended adult amounts of vitamins and minerals would also be… recommended. A guy actually did this in the early 1900s, I’ll find the link
Edit: https://www.nine.com.au/entertainment/viral/angus-barbieri-the-man-who-didnt-eat-anything-for-a-year/c0192ac3-5905-424b-9310-ecb02b87f2f6
Again though, to really stress this point I am saying this is what is TECHNICALLY possible and no one should do this, there is no real research on what it can do to a human. I can’t stress enough how off the wall this would be and the amount of health risks involved. Not eating food can do an unknown amount of damage to your digestive system and possibly ruin it for good, among a myriad of other issues.
TLDR; they could, but very very bad idea
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