No reason why you can’t. Hard thing is sourcing all the ingredients and it is generally not a pleasant experience. Soylent was a big hype a few years ago a lot of people living on shakes, some for all meals because eating was to much of a chore or something.
With enough money/will you can even skip the digestive track and ‘live’ without eating and get your nutrients totally intravenous. This is usually done for terminally ill people who can’t use their gastro intestinal tract, https://en.m.wikipedia.org/wiki/Parenteral_nutrition
It has a lot of complications and risk so it won’t be easy or healthy tho.
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