Many people think that fruits and vegetables have similar nutrients. Eating a catty of fruit a day instead of vegetables is not only nutritious, but also a good time to lose weight, so breakfast and dinner have become fruit meals. There are not a few women who hold this idea, but the question is, can fruits completely replace vegetables? 1. Overall, the nutrition of fruits is lower than that of vegetables. Although both fruits and vegetables contain vitamin C and minerals, their contents are different. Only fresh dates, hawthorn, citrus and kiwifruit are rich in vitamin C, and other fruits are not as rich in vitamin C and minerals as vegetables. The content of vitamin C and iron in green leafy vegetables is very high, which is very important for developing teenagers and women. Eating fruit alone can't completely supplement nutrition. 2. The nutritional structure of fruits and vegetables is different. The content of dietary fiber in vegetables is not only much higher than that in fruits, but also contains insoluble fiber, which can promote intestinal peristalsis and remove toxic substances accumulated in the intestines, and can effectively prevent constipation, hemorrhoids and colorectal cancer, which cannot be achieved by eating fruits. Fruit mainly contains soluble fiber-pectin, which is not easy to be absorbed and will slow down the emptying speed of the stomach. The sugar contained in fruits and vegetables has different effects on the body. The sugars contained in most vegetables are starch polysaccharides, which need to be hydrolyzed into monosaccharides by various enzymes in the human digestive tract before being slowly absorbed, so it will not cause large fluctuations in blood sugar concentration in the human body. The sugars contained in fruits are mainly monosaccharides (fructose, glucose) and disaccharides (sucrose). After they enter the human body, they can be dissolved into the blood with a little digestion. Therefore, eating a lot of fruit in a short time will make the blood sugar concentration rise rapidly, which is not conducive to health. After these monosaccharides and disaccharides enter the human liver, they are easily converted into fat, which makes people fat. Of course, fruit also has its unique function. For example, most fruits contain various organic acids, which can stimulate the secretion of digestive juice. Different fruits and vegetables also have different therapeutic effects. Therefore, 400 -500 grams of fresh vegetables are the main food every day, and then 100 -200 grams of fruit is eaten as a nutritional supplement.