I'll add a little more. Our brain is focused on conditioned reflexes at the sight of the smell, sight, taste of food. That is, purely in theory, yes, you will get everything the body needs for optimal metabolism and homeostasis, but you will not get pleasure, since serotonin will not be released.
Plus, I'd like to point out that different properties of food stimulate digestion. For example, a small amount of wine or spicy foods stimulate the production of hydrochloric acid.
The downside is as follows. First, the teeth must inevitably chew. This will ensure optimal health of the tooth enamel, nerves, scalp muscles and gums. If you stop chewing food: meat, vegetables, fruits, bread - all of the above systems will decline. Secondly, the intestine and stomach must digest different fibers, which are not enough in the tablet shells. If you stop eating foods natural to humans, your peristalsis and the production of digestive enzymes will suffer.
There are already similar developments, you can google "Soylent" - a drink that contains all the necessary substances. It is constantly being improved and improved, like there are people who have been eating only it for a year. But a person still needs solid food for the proper functioning of the digestive system, for the good functioning of the oral cavity, etc.
I will also add that after a couple of days of such nutrition, you will get tired of eating tasteless pills. It will be similar to a diet: you want something tasty, but the difference is that you will not have a deficit of cbju, and if you often break loose on regular food, you will quickly gain weight.
You can .
The advantages are that you do not need to cook, wash, and so on. I bought three cans, two bottles, and that's it. It's fast. You can also select the vitamin and microelement composition and composition for proteins, fats and carbohydrates more accurately than with ordinary products, because everything will be strictly prescribed on the jar. It is known that 50-60% of the caloric content of the diet should be carbohydrates, 10-15% - proteins and 20-30% should be fat. You can clearly calculate the diet, technically it's easier than with regular food. In addition, with such a diet, you do not use carcinogens, do not add extra fats, excluding cooking.
Cons: all these products are quite expensive, and you will need a lot of them, at least for three meals a day. Secondly, the digestibility from artificially prepared food will be lower. We are evolutionarily prepared to assimilate nutrients from food. The same tableted vitamins are absorbed worse. They must be drunk with food, then the assimilation is optimal, when the vitamin is in the food lump, it is better absorbed. If you take a pill without food, the body simply does not feel that it needs to be disposed of. It's the same with mixtures. And the last disadvantage is that in this way you are excluded from an important social aspect of life - going to cafes, eating together.