Step 1: Understanding the Concept:
Antioxidants are substances that inhibit oxidation, a chemical reaction that can produce free radicals, leading to chain reactions that may damage cells.
Step 2: Detailed Explanation:
1. Vitamin E (Tocopherol): It is a fat-soluble vitamin that is a powerful antioxidant.
2. Mechanism: It protects cell membranes from oxidative damage by neutralizing peroxyl radicals, thereby preventing the lipid peroxidation of polyunsaturated fatty acids.
3. Others: Vitamin B1 (Thiamine) is a coenzyme for decarboxylation. Vitamin K is essential for blood clotting. Vitamin D is essential for calcium absorption.
Step 3: Final Answer:
Vitamin E is the primary fat-soluble antioxidant in the body that protects tissues from oxidative stress.