We need a certain proportion of carbohydrates, protein and fat a day, but the vegetables you mentioned can't provide these energies. If you eat like this, the calories will be insufficient and your body will have problems. If you need to lose weight, this method is not recommended.
The harm of not eating staple food:
Spots and acne on the face
Eating vegetables instead of staple food will make you lack necessary vitamins and minerals. I often feel that if I don't have enough to eat, my skin will get worse. The original bright and white skin will turn dark yellow. Even acne and chloasma; Hair becomes unusually dry or greasy; When combing your hair, drop one by one; More seriously, women's ovaries will also shrink.
Cold hands and feet, slow thinking
Many women find that if they only eat vegetables and don't eat staple food for a while, they will lose a little weight (the body fat content will not drop). However, when they have symptoms such as obvious memory loss, slow thinking, cold hands and feet, and have to stop eating staple food to lose weight, their weight will rebound quickly. This is the biggest side effect of eating vegetables instead of staple food to lose weight.