Podcast
Questions and Answers
Which of the following is NOT a good source of vitamin C?
Which of the following is NOT a good source of vitamin C?
What main function does vitamin C serve in the body?
What main function does vitamin C serve in the body?
What is the primary cause of choline deficiency?
What is the primary cause of choline deficiency?
Which condition is associated with excessive vitamin C intake?
Which condition is associated with excessive vitamin C intake?
Signup and view all the answers
What is the established Adequate Intake (AI) for choline per day for men?
What is the established Adequate Intake (AI) for choline per day for men?
Signup and view all the answers
What effect does choline excess have on the body?
What effect does choline excess have on the body?
Signup and view all the answers
What biochemical role does vitamin C play due to its electron donation capability?
What biochemical role does vitamin C play due to its electron donation capability?
Signup and view all the answers
What is the upper limit (UL) for choline intake to prevent adverse effects?
What is the upper limit (UL) for choline intake to prevent adverse effects?
Signup and view all the answers
Study Notes
Vitamin C
-
Food Sources: Excellent sources include citrus fruits (oranges, lemons, limes), strawberries, cantaloupe, and vegetables from the cabbage family (broccoli, cauliflower, bok choy, brussels sprouts), green leafy vegetables, green and red peppers, okra, tomatoes, and potatoes. Meat, fish, eggs, poultry, dairy products, and grains are poor sources.
-
Functions: A water-soluble vitamin, vitamin C donates electrons in biochemical reactions, crucial for connective tissue synthesis and maintenance. It acts as an antioxidant, protecting against reactive oxygen molecules. It also supports the immune system and iron absorption. It's a coenzyme in many biochemical reactions, often adding a hydroxyl group (OH) to other molecules.
-
Adequacy Criterion: The Recommended Dietary Allowance (RDA) for vitamin C is determined by the amount needed to prevent deficiency symptoms.
-
Deficiency: Deficiency results in scurvy.
-
Toxicity: While uncommon, high doses can cause adverse effects.
Choline
-
Functions: Essential for synthesizing crucial molecules like phospholipids (cell membranes), the neurotransmitter acetylcholine, and the methyl donor betaine. It's also involved in biochemical reactions as a source of carbon atoms. Humans can synthesize choline to a limited extent.
-
Adequacy: Adequate Intake (AI) is 550 mg/day for men and 425 mg/day for women, based on the amount needed to prevent liver damage.
-
Deficiency: Causes liver abnormalities.
-
Food Sources: Primarily found in egg yolks, organ meats, spinach, nuts, and wheat germ.
-
Toxicity: An Upper Limit (UL) is set at 3.5 g/day. Excess choline can cause body odour, sweating, reduced growth rate, low blood pressure, and liver damage.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Test your knowledge on Vitamin C, including its sources, functions, and importance in human nutrition. This quiz covers aspects such as deficiency, toxicity, and the Recommended Dietary Allowance. Perfect for students of nutrition and health sciences.
