I often cook with water. Can I eat it for a long time? Is there nutrition?

Boiled vegetables can be eaten for a long time, but don't just boil them and eat nothing else. Because people must eat vegetable oil, because it is rich in unsaturated fatty acids and vitamins. Cooking with only water can lead to intestinal obstruction, constipation and acne, and rough skin. Suggest eating some stir-fry properly.