Antioxidant compounds in human health
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Antioxidant Compounds and Free Radicals in Human Health
Antioxidants are substances that protect cells from damage caused by free radicals—unstable molecules produced during normal metabolism and in response to environmental stressors. If not neutralized, free radicals can harm DNA, proteins, and lipids, contributing to aging and the development of diseases such as cancer, neurodegeneration, diabetes, and cardiovascular disorders Paital2020Halliwell1996Ali2020+4 MORE.
Types of Antioxidants: Endogenous and Dietary Sources
The human body has its own antioxidant defense system, including enzymes like superoxide dismutase, catalase, and peroxidases, as well as non-enzymatic molecules such as glutathione, albumin, and ferritin Paital2020Halliwell1996Ali2020+2 MORE. However, these internal defenses are often not enough to fully prevent oxidative damage, making dietary antioxidants essential for maintaining health Paital2020Halliwell1996Ali2020+3 MORE.
Dietary antioxidants include vitamins C and E, carotenoids, flavonoids, phenolic acids, tannins, lignans, and other plant-derived compounds. These are found abundantly in fruits, vegetables, herbs, spices, seeds, and other plant-based foods Paital2020Halliwell1996Ali2020+6 MORE. There is strong evidence supporting the health benefits of vitamins C and E, while interest in plant phenolics and flavonoids continues to grow Halliwell1996Ali2020Babli2025+5 MORE.
Mechanisms of Antioxidant Action and Health Benefits
Antioxidants work by neutralizing free radicals, thereby preventing oxidative stress and cellular damage. They help protect DNA, proteins, and lipids from oxidation, which is linked to the onset and progression of many chronic diseases Paital2020Halliwell1996Ali2020+5 MORE. Natural antioxidants, especially those from plant sources, have shown significant benefits in reducing the risk of chronic diseases and supporting overall health Babli2025Rahaman2023Tumilaar2024+3 MORE.
Phenolic compounds, particularly flavonoids found in berries and other fruits, are highlighted for their strong antioxidant activity and potential to prevent disease Babli2025Rahaman2023Tumilaar2024+2 MORE. While some antioxidants can act as prooxidants under certain conditions, their physiological relevance is still being studied Halliwell1996Olas2018.
Antioxidants in Disease Prevention and Management
A diet rich in antioxidant-containing fruits and vegetables is associated with a lower risk of chronic diseases, including cardiovascular disease, neurodegenerative disorders, and some cancers Babli2025Rahaman2023Jideani2021+2 MORE. Natural antioxidants from plant sources are preferred over synthetic ones due to concerns about the safety and potential side effects of synthetic compounds Babli2025Rahaman2023Tumilaar2024+1 MORE.
Functional foods and supplements fortified with antioxidants are increasingly available and may help manage oxidative stress-related diseases Ali2020Rahaman2023Jideani2021. However, more well-controlled clinical studies are needed to determine the most effective types and doses of antioxidants for disease prevention and treatment Halliwell2023Olas2018.
Conclusion
Antioxidant compounds, both endogenous and dietary, play a crucial role in protecting human health by neutralizing free radicals and reducing oxidative stress. Consuming a variety of antioxidant-rich foods, especially fruits, vegetables, and plant-based products, supports the body’s defense against chronic diseases and promotes overall well-being. Ongoing research continues to clarify the mechanisms and optimal use of antioxidants in human health management Paital2020Halliwell1996Ali2020+7 MORE.
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