Dark leafy greens are excellent sources of vitamins like Vitamins A and C, and Kale and spinach greens are good sources of fiber. And, according to Harvard, “there is compelling evidence that a diet rich in fruits and vegetables can lower the risk of heart disease. There’s another reason to get more in your diet: dark leafy vegetables like kale and turnip greens are also good sources of calcium.
"Greens are the No. 1 food you can eat regularly to help improve your health," Jill Nussinow, MS, RD, a culinary educator in Northern California and the author of The Veggie Queen, told WebMD. Her favorite is kale, which she likes to coat with olive oil or tahini before cooking.