First of all, this is definitely an unscientific way to eat. After all, the nutrition in rice is limited, and it is impossible to contain all the nutrients needed by the human body.
As early as the Yellow Emperor's Internal Classic, our ancestors said: "Five grains are for nourishment, five fruits are for help, five livestock are for benefit, five vegetables are for filling, and the smell is combined to replenish essence" and "All grains, fruits and vegetables are also harmful to their health".
Modern nutrition also proves that our human body must ingest all kinds of rich nutrients to ensure our health. And these nutrients can only come from various foods.
Next, let's discuss: will eating only vegetables and not eating vegetables make you fat or thin?
In the short term, it mainly depends on the change of energy intake, and the key issue is how much to eat. If you eat the same amount, you may be thin, but you may be unhealthy and lack nutrition. If you eat more than before, you may even get fat.
In the long run, the long-term lack of various nutrients may lead to various problems in the body. Such as diabetes and hypothyroidism. And the early manifestations of these two diseases are emaciation. Of course, human diseases are very complicated, and it is not excluded that some factors may lead to edema or obesity in the body.
In a word, this is a bad and unhealthy way of eating. Don't take this extremely wrong way just because you want to lose weight.