About This Chapter
The Role of Vitamins in Nutrition - Chapter Summary
If you are looking for a resource that can help you understand the role of vitamins in nutrition, you've reached the right place. The engaging video lessons in this chapter offer in-depth analyses of different types of vitamins, how they are classified and how they impact our bodies. Feel confident that you understand these topics by testing your knowledge with short quizzes and a practice exam. If you have questions about the lessons in this chapter, be sure to submit them to our experts. When finished, you will be able to:
- Describe the importance and sources of vitamins we need
- Differentiate between water-soluble and fat-soluble vitamins
- Discuss deficiencies and toxicity symptoms of vitamin C, thiamin and riboflavin
- List toxicity symptoms of niacin, B5, B6, B7, folate and B12
- Explain deficiencies and toxicity symptoms of vitamin A, D, E and K
- Define and discuss the benefits of antioxidants
- Share examples of fortified foods
- Provide the benefits and risks of vitamin supplements
1. Vitamins We Need: Their Importance & Sources
There are a lot of different vitamins, and they come from many different places! This lesson will teach you about what they are, how many different kinds you need, what they do, and where you can obtain them naturally.
2. Classification of Vitamins: Water-soluble & Fat-soluble
Vitamins are classified based on their solubility. The fat-soluble vitamins are A, D, E and K. They can be stored in the body. The water-soluble vitamins are the B-complex vitamins and vitamin C. They are easily flushed out of the body.
3. Vitamin C: Water-Soluble Vitamin Deficiency & Toxicity Symptoms
Vitamin C is soluble in water, so it is easily flushed out of your body. If it is not replenished regularly, it can cause deficiency symptoms, such as scurvy and a reduced ability to fight infection. Toxicity is rare, but can cause GI distress.
4. Thiamin: Water-Soluble Vitamin Deficiency & Toxicity Symptoms
Thiamin (B1) is a water-soluble vitamin that is easily flushed out of the body. If the level of thiamin in the body is too low, it will result in a deficiency disease, such as beriberi or Wernicke-Korsakoff syndrome. There's no toxic level of thiamin.
5. Riboflavin: Water-Soluble Vitamin Deficiency & Toxicity Symptoms
Riboflavin is a water-soluble vitamin, so it is not stored in the body. In this lesson, learn about this vitamin and its effects on the body, including symptoms of too much or too little riboflavin.
6. Niacin, B5, B6 & B7: Water-Soluble Vitamin Deficiency & Toxicity
Water-soluble vitamins, which include niacin, B5, B6 and B7, are easily flushed from the body, making them prone to deficiencies. Learn about these B vitamins and symptoms associated with consuming too few as well as too many of them.
7. Folate: Water-Soluble Vitamin Deficiency & Toxicity Symptoms
Folate, also known as B9, is found naturally in green leafy vegetables and other foods or obtained through folic acid, which is an easily absorbed form of folate. Learn about folate deficiency symptoms, such as neural tube defects, and toxicity symptoms in this lesson.
8. B12: Water-Soluble Vitamin Deficiency & Toxicity Symptoms
Vitamin B12 (cobalamin) is a water-soluble vitamin found naturally in animal products, but also available in fortified plant foods. Learn how pernicious anemia and atrophic gastritis impact B12 absorption and the symptoms of deficiency and toxicity.
9. Vitamin A: Fat-Soluble Vitamin Deficiency and Toxicity Symptoms
Vitamin A is a fat-soluble vitamin that is important for vision and cell differentiation. Learn about conditions that can result when vitamin A is deficient, including night blindness and xerophthalmia, as well as symptoms of toxicity, in this lesson.
10. Vitamin D: Fat-Soluble Vitamin Deficiency & Toxicity Symptoms
Vitamin D is a fat-soluble vitamin that is made by your body when your skin is exposed to the sun. It is also obtained through foods. Learn about conditions that result due to vitamin D deficiency, such as rickets and osteomalacia, as well as symptoms of toxicity.
11. Vitamin E: Fat-Soluble Vitamin Deficiency & Toxicity Symptoms
Vitamin E is a fat-soluble vitamin that acts as an antioxidant. Vitamin E deficiency can cause cell membranes to break down and lead to hemolytic anemia. Learn why this is a problem for premature infants, and also learn about symptoms of toxicity, in this lesson.
12. Vitamin K: Fat-Soluble Vitamin Deficiency & Toxicity Symptoms
Vitamin K is a vitamin needed for blood clotting and bone health. Learn why bleeding and bruising increase in a person with a vitamin K deficiency and why deficiency can increase risk of osteoporosis. Also learn about risks involving overconsumption.
13. What Are Antioxidants? - Definition, Foods & Benefits
In this lesson, you will learn about antioxidants and why they are important to your health. You will also learn how to incorporate foods that are rich in antioxidants into your daily diet.
14. What Are Fortified Foods? - Definition & Examples
Fortifying foods with nutrients has helped to eradicate many nutrition-related conditions. However, fortification may have a dark side. Learn about nutrients that are added to foods and the health benefits and risks of these fortified foods.
15. Vitamin Supplements: Benefits & Risks
Vitamin supplements are intended to add nutritional value to your diet. Learn about groups of people who may benefit from taking vitamin supplements and the possible risks involved when dietary supplements are added to your diet in this lesson.
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Other chapters within the UExcel Science of Nutrition: Study Guide & Test Prep course
- Understanding Nutrition Basics
- Researching Nutrition
- Diet Planning Basics
- Carbohydrates in Nutrition
- Impact of Lipids on Nutrition
- Protein's Role in Nutrition
- Water as a Nutrient
- Minerals in Nutrition
- Symptoms of Major Mineral Deficiency & Toxicity
- Symptoms of Trace Mineral Deficiency & Toxicity
- Gastrointestinal Anatomy and Digestion
- How the Body Handles Nutrients
- Health & Regulation of the GI Tract
- Understanding Cell Anatomy & Metabolism
- Excretion: Urination & Sweat
- Managing the Body's Weight & Energy
- Eating Disorders: Risk to Nutrition
- Role of Physical Fitness in Nutrition
- UExcel Science of Nutrition Flashcards