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Beta-carotene, a red-orange pigment found in various fruits and vegetables, is converted by the body into vitamin A. This vitamin plays a crucial role in several cellular functions, such as maintaining good vision, a robust immune system, healthy skin, as well as reproduction and growth.
Generally, healthy individuals can obtain sufficient vitamin A through their diet, though those with specific medical conditions might find beta-carotene supplements helpful to stave off vitamin A deficiency.
However, there’s a catch: high doses of beta-carotene supplements can be harmful, particularly for smokers and those exposed to asbestos. Research indicates these supplements might increase lung cancer risk.
Interestingly, new studies from UC San Diego suggest that excessive beta-carotene supplementation doesn’t appear to harm individuals suffering from serious illnesses like cancer or heart disease.
This phenomenon has been dubbed the “Cuomo Paradox,” named after biomedical scientist Rafael Cuomo from UC San Diego.
Cuomo’s theory points to warnings from experts regarding harmful factors, such as obesity and elevated cholesterol, as well as particular antioxidant supplements.
According to Cuomo, “Under Cuomo’s paradox, when a serious illness is present, nutrients that would typically be considered unhelpful might actually have a different effect.” He mentions beta-carotene as an example, stating that while high doses might be risky for healthy individuals, there’s no evidence linking it to shorter survival among sick patients.
In essence, the dietary or lifestyle strategies that help prevent illness may not hold the same value after a serious health issue arises, and vice versa.
Cuomo also pointed out that millions live with conditions like cancer or heart disease.
He advises healthcare professionals to tailor recommendations to individual patients, rather than strictly adhering to standard precautionary guidelines. His findings can be referenced in the Journal of Nutrition.
As studies advance, it’s wise to consult a doctor before starting any supplementation with beta-carotene.
Experts typically recommend acquiring beta-carotene through food sources.
Foods such as dark leafy greens, carrots, sweet potatoes, and various orange and yellow fruits and vegetables are rich in beta-carotene, which is a form of provitamin A.
Other vitamin A types, primarily preformed vitamin A or retinol, are commonly found in animal products like liver, fish, dairy, and eggs.
Supplements of beta-carotene could benefit those with conditions like celiac disease, cystic fibrosis, sensitivity to sunlight, or malabsorption issues.
Deficiency symptoms may include night blindness, reproductive issues, dry skin, and respiratory infections.
About 75% of Americans take dietary supplements, with government data showing that various forms of vitamin A are commonplace in these products.
Initially, there was great optimism surrounding beta-carotene supplements as potential cancer preventatives due to their antioxidant properties.
However, this optimism was shattered in the 1990s when research revealed that beta-carotene not only failed to protect but actually increased lung cancer risks in smokers.
While beta-carotene is known as an antioxidant, it can sometimes elevate oxidative stress rather than mitigate it, particularly in the lungs of smokers.
The US Preventive Services Task Force (USPSTF) now advises against using beta-carotene supplements for preventing cardiovascular disease or cancer.
