ELI5 answer:
A balanced diet includes a lot more than just vitamins. You also need to intake proteins, carbohydrates, fats, minerals, fibres, in addition to vitamins.
There are in fact, meal replacement powder/formula, so you can replace a balanced diet with just formula if you want to. The volume of nutrients is much more than what can be contained in pills (you’ll get either one huge pill the size of an orange or you split that into 50 regular sized pills but that’s annoying to swallow every meal). So the idea of an “all in one” meal replacement exist, it’s usually a bottled drink or a cup of powder that you mix with water, not a pill.
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