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The green veggie is a good source of vitamin A, vitamin C, vitamin B6 and manganese. It also provides dietary fiber, calcium, copper, vitamin B6 and potassium. The benefits of kale don't stop there. Researchers have discovered that kale promotes lung health, boosts the immune system and protects against rheumatoid arthritis. When you are searching for kale in the stores, look for batches that have firm, deeply colored leaves and strong stems. Avoid wilted leaves. For a healthy, hearty side dish, sauté kale in olive oil with fresh garlic and spritz with lemon juice. You can also top pizza with kale or add it to a pot of vegetable soup.