Leafy green vegetables are ideal for weight management as they are typically low in calories. They are useful in reducing the risk of cancer and heart disease since they are low in fat, high in dietary fiber, and rich in folic acid, vitamin C, potassium and magnesium, as well as containing a host of phytochemicals, such as lutein, beta-cryptoxanthin,zeaxanthin, and beta-carotene. Because of their high magnesium content and low glycemic index, green leafy vegetables are also valuable for persons with type-2 diabetes. An increase of 1 serving/day of green leafy vegetables was associated with a 9 percent lower risk of diabetes. The high level of vitamin K in greens makes them important for the production of osteocalcin, a protein essential for bone health.

Green leafy vegetables such as kale, chard, collard greens, spinach, parsley and dark green and red leaf lettuce are high in carotenoids and best eaten raw in salads, on healthy sandwiches, lightly steamed or in nutritious soups.