1. Prevention of constipation and colorectal cancer: green vegetables are rich in dietary fiber, can promote intestinal peristalsis, reduce the time of harmful substances in contact with the intestinal wall, to prevent constipation and reduce the incidence of colorectal cancer.

2. Regulate the body metabolism: green vegetables contain potassium, magnesium, phosphorus and other minerals, the body metabolism regulation is helpful.

Note: the amount of bok choy should not be excessive, gastric patients should not be overconsumption, cooking, do not eat raw.

Brussels sprouts are a nutritious vegetable that contains a variety of vitamins, minerals, dietary fiber and antioxidants and other nutrients that can play the following role:

1. Promote digestion: Brussels sprouts are rich in dietary fiber, which can stimulate peristalsis, promote digestion, and relieve constipation.

2. Improve anemia: bok choy is rich in iron can help improve the symptoms of anemia.

3. Reduce blood pressure: Potassium in bok choy can promote sodium excretion, reduce blood pressure and prevent hypertension.

4. Prevent cancer: bok choy is rich in chlorophyll and antioxidants, which can improve the body's resistance to cancer.

5. Enhance immunity: bok choy contains vitamin C, vitamin A and other ingredients, which can enhance human immunity.

Contraindications:

1. Weak spleen and stomach: people with weak spleen and stomach should consume less bok choy, otherwise it will aggravate the burden on the spleen and stomach, resulting in indigestion.

2. Gallbladder disease: people with gallbladder disease should avoid eating too much bok choy because the oxalic acid in bok choy can easily induce cholecystitis.

3. Acute gastroenteritis: people suffering from acute gastroenteritis should be cautious of eating bok choy to avoid aggravating the condition.

In short, bok choy is an extremely common and healthy vegetable that most people can consume in moderation, but for those who are weaker or have a history of related illnesses, they should pay special attention to consume it, and not to overdose on it.