Kale is rich in vitamins A, C, K, calcium, iron, folic acid, fiber, carotene and other nutrients. Every 100 grams of kale contains 4 grams of fiber, 10 times the daily vitamin K required by the human body, and half the daily vitamin A and C required. Kale does not contain gluten, so it is suitable for people with gluten intolerance and high blood sugar, because it is a high-fiber, low-calorie food, and eating it will not cause blood sugar to rise.