Anti-carcinogens are

Carotenoids: The carotenoids are responsible for most of the yellow and red colours of fruits and flowers, and they provide the brilliance of fall when the chlorophyll molecules are degraded to reveal the carotenoids. In addition to their role in transferring energy to reaction centres, the carotenoids serve a safeguarding function. Carotenoids suppress damaging photochemical reactions, paicularly those including oxygen, that can be induced by bright sunlight. Indeed, plants lacking carotenoids are quickly killed on exposure to light and oxygenBeta-carotene and other provitamins A carotenoids are cleaved in the intestinal mucosa by carotene dioxygenase, yielding retinaldehyde, which is reduced to retinol, esterified, and secreted in chylomicrons