8: Nutrients Important for Antioxidant Activity and Vision
- Page ID
- 21147
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- 8.1: Introduction to Free Radicals and Antioxidants
- This page covers free radicals, antioxidants, and oxidative stress, highlighting their significance in health and disease. Free radicals, unstable molecules from oxidation, can cause cellular damage. The body mitigates this with detoxifying enzymes and antioxidants, some sourced internally and others from diet. An imbalance between free radical production and detoxification leads to oxidative stress, linked to chronic diseases like cancer and Alzheimer's.
- 8.2: Antioxidant Nutrients
- This page highlights the significance of antioxidant nutrients, such as Vitamins E and C, and trace minerals like manganese, copper, zinc, selenium, and iron in promoting health and detoxifying free radicals. It emphasizes that a diet rich in these vitamins and minerals provides better protection against chronic diseases than supplements.
- 8.3: Vitamin A and Vision
- This page details Vitamin A, highlighting its role in vision, immune function, and growth. It exists in animal form as retinol and in plant form as carotenoids like beta-carotene. Key functions include supporting night vision and cell growth. Deficiency can cause blindness and worsen disease, while excess intake risks toxicity. Dietary recommendations differ by age, noting that animal sources provide more vitamin A than plant sources.
- 8.4: Cancer
- This page explains cancer as a group of diseases characterized by uncontrolled cell growth, detailing its stages of initiation, promotion, and progression. It highlights the role of DNA mutations from inherited factors or carcinogens in cancer development and categorizes risk factors into unmodifiable (age, family history) and modifiable (tobacco use, obesity, diet).