The existing products have really terrible marketing. They sell them in pharmacies and generally broadcast a message of "for supplementation or diseased/senile people only".
Kudos to Soylent for trying to normalize liquid diets.
Kudos to Soylent for trying to normalize liquid diets.
As for biologically normal, it all turns into a liquid sludge in your stomach, doesn't it? Past that point I don't see how your digestive system can tell the difference as long as the composition of the sludge is similar enough.