You could, the body is incredibly resilient, it would just be impractical.
When food is “put together” in nature it’s easier for us to digest. We share a lot of structures with other plants and animals, eating them helps us replace those structures easier.
Iron is the best example. Iron from spinach is much harder to absorb than heme-iron (like hemaglobin, heme means blood) because we use it in that form. so does anything with a blood supply. With spinach, we have to extract the Iron molecule from the spinach (takes a lot of work/acid/just consume vitamin C with spinach) then convert it to heme Iron.
Obviously heme-iron is a supplement you can buy, but I’m just trying to say.. buying a car with a manual transmission is MUCH easier than buying a car with an automatic transmission and trying to convert it to a manual.
Aside from all that, only eating supplements will NOT be very satisfying. Unless you took all the nutrients and bound them together or something.. but that would just be “food” at that point 😉
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