There have been consistent findings in over thirty epidemiological studies that high intakes
of carotenoid-containing foods and high serum@-carotene levels are associated with lower …

There is growing evidence from in vitro and in vivo laboratory animal studies that β-carotene
can protect phagocytic cells from autooxidative damage, enhance T and B lymphocyte …

Many epidemiological studies have shown an association between diets rich in carotenoids
and a reduced incidence of many forms of cancer, and it has been suggested that the …

Epidemiological studies have consistently shown an inverse correlation between carotene
status and the incidence of cancer. The effect is particularly strong for lung cancer. An …

The colorful group of compounds known as carotenoids are present in many plants, where
they provide photoprotection and act as accessory pigments in photosynthesis. Many …

Carotenoids and retinoids can stimulate some human immune responses. These include
cytoine release with anti-tumor cell activity, increased natural killer cells and activated …

Of 600 carotenoids from natural sources that have been characterized, fewer than 10%
serve as precursors of vitamin A. Many dietary carotenoids, both with and without provitamin …

It has been suggested that carotenoid pigments may function as chemopreventive agents for
reducing the risk of cancer in humans. Part of this suggestion rests on epidemiological …

Early studies demonstrating the ability of dietary carotenes to prevent infections have left
open the possibility that the action of these carotenoids may be through their prior …

As evidence accumulated from epidemiological studies that β-carotene acts as a
chemopreventive agent with respect to inhibiting the appearance of certain types of tumors …