Carotene is converted to vitamin A in the human body. With more light, the plants makes more pigments, chlorophyll and carotenoids, which make the leaves darker in color and more nutritious. The more light a plant receives, the more vitamin C is made from sugars increasing the nutrition content. Leaf lettuce is more nutritious than Iceberg lettuce. Phytochemicals give plants its color, flavor and smell.
Lettuces contain phytochemicals such as vitamin C and carotenoids.
While all fruits and vegetables contain phytochemicals, they will not have the same kind or amount. The research on phytochemicals and their importance in health is still emerging. This increases the importance of eating a variety of fruits and vegetables every day to take advantage of the known nutritional components plus the benefits of phytochemicals.