They can,
A guy made a a mix called Soylent (after the famous movie, soylent green), https://soylent.com/
The idea is that he sat down and checked the basic things a human needs, carbs, fats, proteins, amino acids, vitamins and such and made powder you mix with water and drinking a specific ammount a day will cover your diatry requirements.
theres tons of companies, Soylent, Yfood, Huel, Jimmy Joy….
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