Select lettuce heads that tend to feel heavy for their size. This means they have retained their moisture. Look for soft, tender leaves and avoid any lettuce that has dry, withered leaves on the outside. Check the leaf color. The more colorful the lettuce is, the more nutrients and healthful antioxidants the lettuce contains. The color should be bright and intense. Avoid lettuce with brown or yellowed leaves. Bibb lettuce is a delicate lettuce with pale green, soft cup-shaped leaves. The flavor is mild and sweet.
Lettuce leaves are one of the very low calorie green-vegetables. Vitamins in lettuce are plentiful. Fresh leaves are an excellent source of several Vitamin A and beta carotenes as well as a rich source of vitamin K, vitamin C, and folates, while also containing lots of minerals like iron, calcium, magnesium, and potassium, which are very essential for body metabolism.