Malnutrition and some diseases.

Vegetables and fruits contain a lot of vitamins and dietary fiber. If you don't eat them for a long time, you may get night blindness, anemia, coronary heart disease and so on.

If you don't eat vegetables and fruits for a long time, you are prone to iron deficiency anemia. Because most of the iron in lean meat, animal viscera and egg yolk is trivalent iron, it is not easy to be absorbed by the human body. Only when vitamin C and sour substances exist, can it be fully absorbed and utilized by the human body when it is converted into ferrous iron. Vitamin C and sour substances are the most abundant in vegetables and fruits. If you are used to eating only lean meat and other foods, but don't eat or eat less vegetables and fruits, the iron in these foods can't be absorbed and utilized by the human body, resulting in a great waste of nutrition and iron deficiency anemia.

Even eating only fruit is wrong. Vegetables and fruits are similar in nutrients and health care effects, so many people think they can replace each other. In fact, the contents of minerals and vitamins in vegetables generally exceed those in fruits, and the intake of vegetables in the diet is large, which provides most of the dietary fiber, vitamin C and carotene needed by the human body. So fruits can't replace vegetables. At the same time, carbohydrates, organic acids and aromatic substances in fruits are higher than those in vegetables, so eat more at ordinary times.

You can know the nutritional information of fruits and vegetables by their colors. Natural pigments of plants are some substances mainly used to prevent diseases. Different colors represent different nutrients.

Orange: Orange vegetables such as carrots contain a lot of beta-carotene. The orange color of mango and cantaloupe also indicates the content of β-carotene. β -carotene is a red or orange natural pigment and an important plant nutrient. Besides mangoes and carrots, green leafy vegetables such as papaya and yam also contain β-carotene, such as spinach, kale and sweet potato leaves. Beta-carotene also has the functions of preventing various diseases and resisting aging. Therefore, eating more carrots is not only good for vision health, but also can delay the aging process.

Red: Pink grapefruit, watermelon and tomato all contain lycopene, which is an important component with antioxidant properties. This antioxidant is often used in dietary supplements to prevent cancer and heart disease. Eating more foods rich in antioxidants is especially beneficial to prevent various diseases.