Some population studies have indicated that carotenoid-rich diets are associated with reduced risk of some forms of cancer. Other studies did not show a clear preventive effect of carotenoids *.
Some evidence points to a role of carotenoids in protecting the skin from sun damage e.g., sunburn.
Age-related eye disorders
The results of population studies suggest that diets rich in carotenoids may help to slow the development of age-related macular degeneration. The macula is the part of the retina responsible for central vision. Carotenoids can also help prevent the onset of cataracts or clouding in the lens, which untreated, causes sight loss.
In a number of studies, carotenoid supplementation was found to enhance certain immune responses potentially preventing infections. More research is needed to evaluate these effects*.
*see also Principles – The complexity of micronutrient research