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A 2018 meta-analysis found that both dietary and circulating α-carotene are associated with a lower risk of all-cause mortality.The highest circulating α-carotene category, compared to the lowest, correlated with a 32% reduction in the risk of all-cause mortality, while increased dietary α-carotene intake was linked to a 21% decrease in the risk of all-cause mortality.
Vitamin A occurs as two principal forms in foods: A) retinoids, found in animal-sourced foods, either as retinol or bound to a fatty acid to become a retinyl ester, and B) the carotenoids α-carotene (alpha-carotene), β-carotene, γ-carotene (gamma-carotene), and the xanthophyll beta-cryptoxanthin (all of which contain β-ionone rings) that ...
Reviews of preliminary research in 2015 indicated that foods high in carotenoids may reduce the risk of head and neck cancers [20] and prostate cancer. [21] There is no correlation between consumption of foods high in carotenoids and vitamin A and the risk of Parkinson's disease. [22]
ORANGE FRUITS AND VEGETABLES. These foods "are high in beta-carotene, the precursor to vitamin A and vitamin C, both essential nutrients to support a healthy immune system."
Alpha-carotene - found in carrots, winter squash, tomatoes, green beans, cilantro, Swiss chard; Astaxanthin - found naturally in red algae and animals higher in the marine food chain. It is a red pigment familiarly recognized in crustacean shells and salmon flesh/roe.
The Mayo Clinic diet, a program that adheres to this notion, was developed by medical professionals based on scientific research, so you can trust that this program is based on science, and not ...
β-Carotene is composed of two retinyl groups, and is broken down in the mucosa of the human small intestine by β-carotene 15,15'-monooxygenase to retinal,a form of vitamin A. β-Carotene can be stored in the liver and body fat and converted to retinal as needed, thus making it a form of vitamin A for humans and some other mammals.
Others, such as some polyphenols and flavonoids, may be pro-oxidants in high ingested amounts. [23] Non-digestible dietary fibers from plant foods, often considered as a phytochemical, [24] are now generally regarded as a nutrient group having approved health claims for reducing the risk of some types of cancer [25] and coronary heart disease. [26]