Cos Lettuce

Cos lettuce is a variety of lettuce which grows in a long head of sturdy leaves with a firm rib down the center. Unlike most lettuces, it is tolerant of heat. Cos lettuce develops into an elongated, somewhat oval shaped head. Leaves are elongated, with thick stems and mid-ribs. Heads are only medium firm, and up to 9 or 10 inches in length. Outer leaves, which are largely discarded, enfold the head during late stages of growth.

Nutritional Facts

The nutritional value of lettuce varies with the variety. Lettuce in general provides small amounts of dietary fiber, some carbohydrates, a little protein and a trace of fat. Its most important nutrients are vitamin A and potassium. The vitamin A comes from beta carotene, whose yellow-orange is hidden by green chlorophyll pigments. Beta carotene, of course, is converted to vitamin A in the human body.

Medicinal / Therapeutic Use

According to the American Cancer Institute and the American Cancer Society, foods rich in vitamin A and C (antioxidants) offer protection against some forms of cancer. Along with other phytochemical, antioxidants reduce the risk of cancer of the respiratory system and intestinal tract.