Oxygen Radical Protection: Antioxidants & Health
Oxygen radical protection refers to the body's natural and nutrition-based defence against free radicals that can damage cells and tissue.
Things worth knowing about "Oxygen radical protection"
Oxygen radical protection refers to the body's natural and nutrition-based defence against free radicals that can damage cells and tissue.
What Is Oxygen Radical Protection?
Oxygen radical protection describes all mechanisms and measures that shield the body from the harmful effects of so-called free radicals. Free radicals are highly reactive oxygen-containing molecules – also known as reactive oxygen species (ROS) – that are generated during normal metabolic processes but can also be produced in excess by external factors such as UV radiation, tobacco smoke, environmental toxins, or an unbalanced diet.
How Free Radicals Are Formed
Free radicals are molecules or atoms with at least one unpaired electron. This makes them extremely reactive: they attack neighbouring cell structures to obtain the missing electron, triggering chain reactions that can damage cell membranes, proteins, and DNA. This process is known as oxidative stress.
Key sources of oxidative stress include:
- Natural cellular respiration and energy production in the mitochondria
- Chronic inflammation
- UV and ionising radiation
- Cigarette smoke and air pollutants
- Alcohol and certain medications
- Intense physical exertion
- An unbalanced, nutrient-poor diet
The Body's Own Defence Mechanisms
The human body has a sophisticated, enzyme-based antioxidant system that neutralises free radicals before they can cause harm. The most important endogenous protective enzymes include:
- Superoxide dismutase (SOD): converts superoxide radicals into less reactive compounds
- Catalase: breaks down hydrogen peroxide into water and oxygen
- Glutathione peroxidase: protects cell membranes from oxidative damage
These enzyme systems rely on specific micronutrients as cofactors, including zinc, copper, manganese, and selenium.
Antioxidants from the Diet
In addition to the body's own defence systems, a balanced diet provides important exogenous antioxidants that support oxygen radical protection. The most significant dietary antioxidants include:
- Vitamin C (ascorbic acid): water-soluble, neutralises radicals in aqueous environments and regenerates vitamin E
- Vitamin E (tocopherol): fat-soluble, protects cell membranes from lipid peroxidation
- Beta-carotene and carotenoids: precursors of vitamin A, act as radical scavengers
- Selenium: essential cofactor for glutathione peroxidase enzymes
- Zinc: supports superoxide dismutase and immune defence
- Polyphenols (e.g. from berries, green tea, red wine, olive oil, cocoa): diverse antioxidant and anti-inflammatory effects
- Flavonoids (e.g. quercetin, rutin): plant secondary metabolites with strong antioxidant activity
- Coenzyme Q10: a fat-soluble antioxidant active within the mitochondrial membrane
Relevance for Health and Disease Prevention
Insufficient oxygen radical protection and persistent oxidative stress are associated with a wide range of chronic diseases, including:
- Cardiovascular diseases (e.g. atherosclerosis)
- Neurodegenerative diseases (e.g. Alzheimer's disease, Parkinson's disease)
- Cancer (oxidative DNA damage as a contributing factor)
- Type 2 diabetes mellitus
- Premature skin ageing
- Chronic inflammatory conditions
At the same time, a certain level of free radicals is necessary for the body: the immune system uses them specifically to combat pathogens. Maintaining a healthy balance between oxidative stress and antioxidant defence is therefore crucial for overall health.
Practical Recommendations
To strengthen oxygen radical protection in everyday life, nutrition experts and medical societies recommend:
- Daily consumption of fruit and vegetables (at least 5 portions according to WHO guidelines)
- Favouring a Mediterranean-style diet with olive oil, nuts, legumes, and fatty fish
- Avoiding smoking and excessive alcohol consumption
- Regular, moderate physical activity
- Targeted use of dietary supplements in cases of confirmed deficiency (following medical advice)
- Protection from excessive UV radiation
References
- World Health Organization (WHO): Diet, Nutrition and the Prevention of Chronic Diseases. WHO Technical Report Series 916, Geneva 2003.
- Halliwell B, Gutteridge JMC: Free Radicals in Biology and Medicine. 5th edition, Oxford University Press, Oxford 2015.
- Pham-Huy LA, He H, Pham-Huy C: Free Radicals, Antioxidants in Disease and Health. International Journal of Biomedical Science. 2008;4(2):89-96. PubMed PMID: 23675073.
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