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Questions and Answers
Which of the following statements about the primary function of vitamin E is correct?
Which of the following statements about the primary function of vitamin E is correct?
- Vitamin E functions as an antioxidant preventing nonenzymic oxidation. (correct)
- Vitamin E acts as an enzyme in the oxidative processes.
- Vitamin E's primary role is in glucose metabolism.
- Vitamin E increases the enzymic oxidation of saturated fatty acids.
Which source has the highest concentration of vitamin E?
Which source has the highest concentration of vitamin E?
- Fish
- Vegetable oils (correct)
- Eggs
- Liver
What is the Recommended Dietary Allowance (RDA) for α-tocopherol in adults?
What is the Recommended Dietary Allowance (RDA) for α-tocopherol in adults?
- 5 mg
- 15 mg (correct)
- 10 mg
- 20 mg
As the intake of which type of nutrient increases, the requirement for vitamin E also increases?
As the intake of which type of nutrient increases, the requirement for vitamin E also increases?
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At what daily dose has no toxicity been observed for vitamin E?
At what daily dose has no toxicity been observed for vitamin E?
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Study Notes
Vitamin E
- The E vitamins consist of eight naturally occurring tocopherols, with α-tocopherol being the most active.
Functions of Vitamin E
- Acts as an antioxidant to prevent nonenzymic oxidation of cell components, such as polyunsaturated fatty acids, by molecular oxygen and free radicals.
Sources of Vitamin E
- Vegetable oils are rich sources of vitamin E.
- Liver and eggs contain moderate amounts of vitamin E.
Recommended Dietary Allowance (RDA) of Vitamin E
- The RDA for α-tocopherol is 15mg for adults.
- Vitamin E requirement increases with the intake of polyunsaturated fatty acid.
Toxicity of Vitamin E
- Vitamin E is the least toxic of the fat-soluble vitamins.
- No toxicity has been observed at doses of 300 mg/day.
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Description
Learn about the antioxidant properties and sources of Vitamin E, including its role in preventing cell component oxidation and its abundance in vegetable oils, liver, and eggs.
