News tagged with antioxidants

Related topics: heart disease

Review: Organic foods may be healthier

(HealthDay)—Organic produce and grains contain more protective antioxidants, less pesticide residue, and lower levels of the toxic metal cadmium than food raised in traditional ways, according to a new ...

Jul 16, 2014
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Chemical companies shore up supplement science

As evidence mounts showing the potential health benefits of probiotics, antioxidants and other nutritional compounds, more and more people are taking supplements. And the chemical industry is getting in on the action. But ...

Apr 23, 2014
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Adding antioxidants to a sun protection plan

With winter finally in the rearview mirror, many people are making plans for fun outdoors. But don't stop at sunscreen and a hat for sun protection: a UC Health skin care specialist recommends adding another item to your ...

Apr 04, 2014
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Strawberries lower cholesterol

A team of volunteers ate half a kilo of strawberries a day for a month to see whether it altered their blood parameters in any way. At the end of this unusual treatment, their levels of bad cholesterol and ...

Feb 25, 2014
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Antioxidant

An antioxidant is a molecule capable of slowing or preventing the oxidation of other molecules. Oxidation is a chemical reaction that transfers electrons from a substance to an oxidizing agent. Oxidation reactions can produce free radicals, which start chain reactions that damage cells. Antioxidants terminate these chain reactions by removing free radical intermediates, and inhibit other oxidation reactions by being oxidized themselves. As a result, antioxidants are often reducing agents such as thiols, ascorbic acid or polyphenols.

Although oxidation reactions are crucial for life, they can also be damaging; hence, plants and animals maintain complex systems of multiple types of antioxidants, such as glutathione, vitamin C, and vitamin E as well as enzymes such as catalase, superoxide dismutase and various peroxidases. Low levels of antioxidants, or inhibition of the antioxidant enzymes, causes oxidative stress and may damage or kill cells.

As oxidative stress might be an important part of many human diseases, the use of antioxidants in pharmacology is intensively studied, particularly as treatments for stroke and neurodegenerative diseases. However, it is unknown whether oxidative stress is the cause or the consequence of disease. Antioxidants are also widely used as ingredients in dietary supplements in the hope of maintaining health and preventing diseases such as cancer and coronary heart disease. Although initial studies suggested that antioxidant supplements might promote health, later large clinical trials did not detect any benefit and suggested instead that excess supplementation may be harmful. In addition to these uses of natural antioxidants in medicine, these compounds have many industrial uses, such as preservatives in food and cosmetics and preventing the degradation of rubber and gasoline.

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