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Oxidative damage and defense

R A Jacob1, B J Burri

  • 1USDA, Agricultural Research Service, Western Human Nutrition Research Center, San Francisco, CA 94129, USA.

The American Journal of Clinical Nutrition
|June 1, 1996
PubMed
Summary
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Dietary antioxidants like ascorbic acid and vitamin E may protect against diseases linked to oxidative stress. However, more research is needed to confirm their benefits and optimal intake for disease prevention.

Area of Science:

  • Biochemistry
  • Nutrition Science
  • Disease Prevention

Background:

  • Reactive oxygen species (ROS) production is implicated in numerous human diseases, including cardiovascular disease and cancer.
  • Dietary antioxidants are crucial for mitigating free radical damage to cellular components like DNA, lipids, and proteins.
  • Epidemiological studies suggest a link between adequate intake of antioxidants such as ascorbic acid (vitamin C), vitamin E, and beta-carotene and reduced risk of certain chronic diseases.

Purpose of the Study:

  • To review the current understanding of the role of dietary antioxidants in protecting against oxidative stress and related human diseases.
  • To evaluate the evidence for specific antioxidants (ascorbic acid, vitamin E, beta-carotene) in disease prevention.
  • To identify knowledge gaps and areas for future research regarding antioxidant function and requirements.

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Main Methods:

  • Review of existing epidemiological studies and intervention trials on dietary antioxidants and disease risk.
  • Analysis of the biochemical roles of key antioxidants, including ascorbic acid, vitamin E, and beta-carotene.
  • Discussion of the complexities of antioxidant action, including potential prooxidant effects and the influence of food matrices.

Main Results:

  • Ascorbic acid is linked to reduced risk of cancer and cataracts.
  • High vitamin E intake is associated with decreased coronary heart disease risk, potentially by inhibiting oxidized LDL.
  • Beta-carotene offers protection against lipid peroxidation and provides provitamin A activity, but data are insufficient to establish requirements for oxidative damage protection.

Conclusions:

  • Current data are insufficient to quantify micronutrient requirements for preventing oxidative damage.
  • The antioxidant roles of many food constituents, like polyphenols, remain unclear, and their in vivo prooxidant potential requires further investigation.
  • While antioxidant supplements have shown mixed results, a varied diet rich in fruits and vegetables likely provides the best protection against oxidative damage and related diseases.