About This Chapter
How Vitamins Support Nutrition - Chapter Summary
Vitamins' role in maintaining the health of our bodies is the topic of this chapter. These lessons show you how vitamins are classified and outline the health effects of thiamine, riboflavin, B12 and vitamin A, among others. Nutrition professionals also introduce you to symptoms of vitamin deficiency and toxicity and help you identify food sources of vitamins. At the end of this chapter you'll be familiar with:
- Fat-soluble vitamins
- Water-soluble vitamins
- Vitamin toxicity
- Vitamin deficiency
Each lesson in this chapter contains a short, self-paced video as well as a transcript that features key terms in bold. Plus, you can check your understanding of the lesson topics at any point during your studies with multiple-choice lesson quizzes and a chapter test. Responses link back to the corresponding video content, allowing you to shore up any areas requiring some additional study time.
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. 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 Nutrition 101: Science of Nutrition course
- Introduction to Nutrition
- Healthy Diet Planning
- Role of Carbohydrates in Nutrition
- Role of Lipids in Nutrition
- Protein's Role in Nutrition
- Role of Water in Nutrition
- Minerals in Nutrition
- Symptoms of Mineral Deficiency & Toxicity
- Anatomy of the Digestive System
- Nutrient Digestion, Absorption & Transport
- Cell Anatomy & Metabolism
- Weight Management & Energy Needs
- Eating Disorders: Risk to Nutrition
- Physical Activity & Nutrition
- Studying for Nutrition 101