What are the nutritional components of vegetables? What's the role?

The nutritional value of each vegetable will not be the same, for example:

1, cucumber

Cucumber contains vitamin C, vitamin B and many trace minerals. Rich in nutrition and crisp and refreshing when eaten raw. From the point of view of nutrition, cucumber skin is rich in nutrition and should be eaten raw. However, in order to prevent the harm of pesticide residues to human body, cucumber should be soaked in salt water 15-20 minutes before being washed and eaten raw. When soaking cucumbers in salt water, don't pinch your head and remove the roots. Keep the cucumber intact and avoid the loss of nutrients in the cut surface during soaking. In addition, cold salad should be cooked and eaten now, and it should not be put for a long time after it is done, which will also lead to the loss of vitamins.

2. tomatoes

Tomatoes are rich in vitamin A, which is beneficial to vision protection and skin repair after sun exposure. It is best not to sprinkle sugar on cold tomatoes, otherwise the sweetness may affect the appetite. Obesity, diabetes, diabetics and patients with hypertension should not eat sugared tomatoes and cold salad called "Flame Mountain in Snow Area".

3, persimmon pepper

Pepper is the food with the richest vitamin C content in all vegetables. Vitamin C can improve human immunity and help to resist various diseases.

4.celery

Celery is rich in crude fiber, potassium, vitamin B2 and vitamin (also called nicotinic acid). It is hot every day in summer, and people easily get angry, which leads to dry stool. At the same time, in hot weather, people will lose a lot of water, which is easy to cause the imbalance of sodium and potassium. Celery can help people relax bowels and adjust the balance of sodium and potassium. Vitamins have effects on people's skin, nervous system and appetite. If people lack vitamin B2, they are likely to cause fatigue and oral ulcers. Celery leaves contain more nutrients than stems, but it is a pity to throw them away. You can blanch them and eat them cold.

5. Chinese cabbage

Chinese cabbage is rich in dietary fiber and vitamin A. Eating more fresh Chinese cabbage in sunny summer is good for eye protection and beauty. However, don't eat Chinese cabbage that has been stored for too long and lost too much nutrients. In addition, patients with peptic ulcer should not eat Chinese cabbage raw to avoid rubbing crude fiber to stimulate gastrointestinal wounds.