Purple kale generally refers to collards, and kale can usually be consumed in moderation by all people except those who are allergic to kale. Purple kale is a common vegetable. The nutrients in kale are relatively rich, each 100g contains dietary fiber 1g, vitamin C40mg, and a variety of minerals, such as calcium 49mg, iron 0.6mg, potassium 120mg, anthocyanins 100mg, etc., the same kind of substances in the higher content of anthocyanins, which is one of the most common antioxidant substances. Dietary fiber in purple kale can promote gastrointestinal peristalsis, relieve constipation, promote digestion has a certain effect. The nutrients in kale can also be absorbed by the body and converted into substances needed for human physiological activities. The general public can eat a moderate amount of purple kale, but allergic to it is prohibited to eat.