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What is a simple definition of vitamins?
Vitamins are substances that our bodies need to develop and function normally. They include vitamins A, C, D, E, and K, choline, and the B vitamins (thiamin, riboflavin, niacin, pantothenic acid, biotin, vitamin B6, vitamin B12, and folate/folic acid).
What is the best definition vitamin?
Definition of ‘vitamin’ Vitamins are substances that you need in order to remain healthy, which are found in food or can be eaten in the form of pills. Butter, margarine, and oily fish are all good sources of vitamin D. Healthy people do not need vitamin supplements.
What is a vitamin in biology?
A vitamin is an organic compound that is essential for the normal growth and metabolic processes of an organism. The organism is not capable of synthesizing an adequate amount of such chemical compound and therefore must obtain it in its diet.
What are the two characteristics that define a vitamin?
Vitamins can be classified according to their solubility — water-soluble and fat-soluble. Learn more about vitamins and discover how the characteristics of water-soluble and fat-soluble vitamins differ. Minerals are inorganic compounds that are needed to regulate the body’s overall health.
Why is vitamin A deficiency?
Vitamin A deficiency can result from inadequate intake, fat malabsorption, or liver disorders. Deficiency impairs immunity and hematopoiesis and causes rashes and typical ocular effects (eg, xerophthalmia, night blindness). Diagnosis is based on typical ocular findings and low vitamin A levels.
What is vitamin and function?
Vitamins are a group of substances that are needed for normal cell function, growth, and development. There are 13 essential vitamins. This means that these vitamins are required for the body to work properly.
Are all vitamins amines?
While it is true that some vitamins are amines, most are not; some are effective for multiple diseases, while one does not come primarily from food.
What are the 5 most important vitamins?
We asked four experts to tell us which seven ingredients your multivitamin should have, no matter what brand you choose.
- Vitamin D. Vitamin D helps our bodies absorb calcium, which is important for bone health.
- Magnesium.
- Calcium.
- Zinc.
- Iron.
- Folate.
- Vitamin B-12.
What are vitamins classify them?
Vitamins are classified as either water-soluble or fat-soluble. In humans there are 13 vitamins: 4 fat-soluble (A, D, E, and K) and 9 water-soluble (8 B vitamins and vitamin C).
What are the symptoms of low vitamin A?
Symptoms of a Vitamin A Deficiency
- Night blindness. This causes you to have trouble seeing in low light.
- Xerophthalmia. With this condition, the eyes may become very dry and crusted, which may damage the cornea and retina.
- Infection.
- Bitot spots.
- Skin irritation.
- Keratomalacia.
- Keratinisation.
- Stunted growth.
What happens when you have too much vitamin A?
Getting too much preformed vitamin A (usually from supplements or certain medicines) can cause dizziness, nausea, headaches, coma, and even death. High intakes of preformed vitamin A in pregnant women can also cause birth defects in their babies.
What is vitamin A deficiency?
Vitamin A deficiency can lead to dry eyes, blindness or dying corneas, also known as Bitot’s spots. One of the first signs of deficiency is often an inability to produce tears.
What is vitamin an and why do we need it?
Vitamin A is a fat-soluble vitamin that is naturally present in many foods. Vitamin A is important for normal vision, the immune system, and reproduction . Vitamin A also helps the heart, lungs, kidneys, and other organs work properly. There are two different types of vitamin A.
What has vitamin an in it?
Vitamin A Introduction. Recommended Intakes. Sources of Vitamin A. Vitamin A Intakes and Status. Vitamin A Deficiency. Groups at Risk of Vitamin A Inadequacy. Vitamin A and Health. Health Risks from Excessive Vitamin A. Interactions with Medications. Vitamin A and Healthful Diets.
What are symptoms of too much vitamin?
Too much vitamin D3 causes hypercalcemia, or excessive calcium levels. It is the hypercalcemia that causes the symptoms of vitamin D toxicity, which include gastrointestinal problems such as nausea, vomiting and constipation; lack of appetite; weakness; confusion; nervousness; and abnormal heart rhythms.
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