So, let's take a simple example in life. When a person who is ill in hospital at ordinary times is brought to the hospital by his family, he often praises some soup, and rarely lets him eat meat directly, because at this time, patients are in urgent need of nutrients, and if they drink soup, they will soon achieve their goals. Serious patients can't eat by themselves, and they may even have no ability to chew and swallow food, and they can't eat meat. It would be much easier if they had soup. Even if the illness is not serious, you can eat meat by yourself, but eating too much is easy to go to the toilet, which is also a very troublesome thing.
Moreover, if you eat meat, there are many ways to do it, and basically you have to put oil in it. You can cook it without oil, but it's generally not delicious. If the food is not delicious, people will definitely have no appetite, so naturally they will eat less. Eating greasy things is not good for the human body, and even some people with poor digestion will easily lead to diarrhea.
The soup is much better. First of all, there is no need to put oil in the soup, so don't worry about the greasy problem. Moreover, the soup is generally very fresh, which is easier to appetize and people's appetite is good. If you drink more soup, you can get enough nutrition.