Below is an excerpt from an article on WebMD regarding the ten most nutritious leafy greens. I have removed the ones that we do not grow at Four Oaks Farms. Just as a side note the least nutritious leafy green is iceberg lettuce.
This is was compiled by Jill Nussinow a research dietician
No. 1 Kale: This nutrition powerhouse “offers everything you want in a leafy green,” says Nussinow, who gave it her first-place ranking. It’s an excellent source of vitamins A C, and K, has a good amount of calcium for a vegetable, and also supplies folate and potassium. Kale’s ruffle-edged leaves may range in color from cream to purple to black depending on the variety.
Before cooking with kale, collards, turnips, and chard, Nussinow recommends swishing the greens in a water-filled sink, draining the sink, then repeating this rinse until the leaves are dirt-free. Her favorite cooking method for these four greens is to rub the leaves in olive oil or tahini (sesame paste) and cook them for five minutes with garlic, olive oil, and broth.
No 4 Swiss chard: With red stems, stalks, and veins on its leaves, Swiss chard has a beet-like taste and soft texture that’s perfect for sautéing. Both Swiss chard and spinach contain oxalates, which are slightly reduced by cooking and can bind to calcium, a concern for people prone to kidney stones. Chard contains 15 calories in one-half cup and is a good source of vitamins A and C. Nussinow likes to make a sweet-and-sour chard by adding raisins and vinegar to the cooked greens.
No. 5 Spinach: Popeye’s favorite vegetable has 20 calories per serving, plus it’s packed with vitamins A and C, as well as folate. And because heat reduces the green’s oxalate content, freeing up its dietary calcium, “cooked spinach gives you more nutrition than raw,” says Nussinow. Spinach leaves can be cooked quickly in the water that remains on them after rinsing, or they can be eaten raw in salads. Bags of frozen chopped spinach are more convenient to use than block kinds, and this mild-flavored vegetable can be added to soups, pasta dishes, and casseroles.
No 8 Red and Green Leaf and Romaine Lettuce: A familiar sight in salad bowls, these lettuces are high in vitamin A and offer some folate. Leaf lettuces have a softer texture than romaine, a crunchy variety used in Caesar salads. Fans of Iceberg lettuce may go for romaine, a crispy green that’s better for you. Nussinow points out “the darker the lettuce leaf, the more nutrition it has,” making red leaf slightly healthier than green. If you don’t drown lettuce in a creamy dressing, one cup contains 10 calories.