Updated September 26, 2014.

Definition:

Carotenoids are a group of several hundred substances (plant pigments) found in yellow and orange fruits and vegetables, and in dark green, leafy vegetables.

Dietary (but not supplemental) carotenoids may reduce the risk of lung cancer.

A few of the better known carotenoids include beta carotene, beta-cryptoxanthin, lutein, lycopene, and zeaxanthin.