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Antioxidants and carcinogenesis
1Cancer Prevention Unit, National Public Health Institute, Helsinki, Finland.
Abstract:
It is established beyond doubt that free radicals in tissues and cells can damage DNA, proteins, carbohydrates and lipids. These potentially deleterious reactions are at least partly controlled by antioxidants capable of scavenging free radicals. It is widely believed that a proper balance between free radicals and antioxidants is essential for the health of an organism. A vast body of observational epidemiological studies has suggested that high intake of dietary or supplemental antioxidants protects against ischaemic heart disease, various types of cancer and several other diseases. Final proof for the beneficial effects of antioxidants can, however, be obtained from controlled studies. Conflicting results of the first three major clinical trials force us to postpone conclusions of the usefulness of antioxidant supplements in disease prevention until the other on-going trials have been published.
Insights
Antioxidants protect cells from damage by free radicals, which are linked to diseases. However, clinical trials show conflicting results, requiring more research before antioxidant supplements can be recommended for disease prevention.
Area of Science:
- Biochemistry
- Cell Biology
- Nutritional Science
Background:
- Free radicals cause cellular damage to DNA, proteins, lipids, and carbohydrates.
- Antioxidants neutralize free radicals, maintaining cellular health.
- A balance between free radicals and antioxidants is crucial for organismal health.
Purpose of the Study:
- To review the role of antioxidants in preventing diseases.
- To evaluate the evidence from epidemiological and clinical studies on antioxidant efficacy.
Main Methods:
- Review of observational epidemiological studies.
- Analysis of results from major clinical trials on antioxidant supplements.
Main Results:
- Epidemiological studies suggest antioxidant benefits against heart disease and cancer.
- Initial clinical trials yielded conflicting results regarding disease prevention.
- Ongoing trials are expected to provide further evidence.
Conclusions:
- While observational data is promising, definitive conclusions on antioxidant supplements for disease prevention await further clinical trial results.
- The efficacy of antioxidant supplements in preventing major diseases remains uncertain.
- Further research is needed to clarify the role of antioxidants in health and disease.