Essential nutrients, Science

Essential nutrients:

Our body is a biochemical factory which can make many compounds  for its needs. However, there are limits to this, and what our body cannot make has to be provided by  a suitable  choice of food. Such compounds are called essential nutrients. Each one of  the nutrients has many components. For example. most proteins are composed of twelve to twenty different amino acids. Ten of them cannot be manufactured by  the body and have to be  supplied through diet. They are called essential amino acids. The remaining are non- essential amino acids,  in  the sense that they can be made in the body  from any protein food we  take. Similarly,  a large number of vitamins and minerals and some fatty acids cannot be made in the body. So  they must be  included in  the diet. 

Plant Proteins vs Animal Proteins 

Proteins can be obtained from a variety of sources,  such as grains, pulses, nuts, milk, fish, meat:eggs,  etc. But the nutritive quality and digestibility of these proteins is not equal. They are present in different amounts in different food stuffs  and their quality and the ease with which they can be digestedcalso differs with their so,urce.  Animal proteins have all the essential amino acids and are called complete or high-quality proteins. They also have much higher digestibility.  Plant proteins lack one or more essential amino acids an+re called incomplete proteins. Their digestibility is about 60%.  Proteins, obtained from a variety of plant sources  can together be made as good as a single animal protein, because what is missing in one plant protein may be compensated by  another. For  instance, in a meal of cereals and pulses plant the essential amino acids missing in cereals are found.in pulses and vice versa. Surprisingly, we Indians have been eating a combination of chapati-dal, or rice- dal over the years, probably out of wisdom or experience. without any knowledge of the existence  of amino acids. Remember, a mixed diet of various cereals, millets and pulses can fulfil the total nutritional requirements of vegetarians. Soyabean is the richest source of  plant protein. In comparison to other legumes, it contains twice as much protein. Eggs are relatively a cheaper source of high-quality proteins when compared to meat. In  India, a large percentage of  people can afford only cereals which contain mostly carbohydrates. Protein foods are expensive,  thou'gh even the prices of vegetables are going up. Scientists all over the world are trying to find ways and means of obtaining proteins from new  sources. Methods of extracting proteins  

Posted Date: 9/28/2012 7:15:15 AM | Location : United States







Related Discussions:- Essential nutrients, Assignment Help, Ask Question on Essential nutrients, Get Answer, Expert's Help, Essential nutrients Discussions

Write discussion on Essential nutrients
Your posts are moderated
Related Questions
Chemical reactivity : The substances which react violently or produce flame on contact with water can be given suitable chemical treatment to convert them into nonreactive form be

Define Haemorrhagic or Blood Loss Anaemia The body replaces plasma within 1-3 days after a haemorrhage, but this leaves a low concentration of red blood cells. In chronic bloo

what is the virus

Question 1 Which of the following is best control group for double blind Phase II clinical trial? Justify your Answer. Placebo Concurrent Control No-treatment Concurrent

Define White Blood cells (WBCs) WBCs are also called leukocytes, as they are colourless. They are the army of the human body. Whenever a germ or infection enters our body, the

Vitamin E  (Tocopherols) Vitamin E is an essential fat-soluble vitamin that functions, at  least in part, as a lipid- soluble antioxidant. Presence of vitamin E was first revea

A glacier that has neither advanced nor retreated for many years deposits:- end moraine

Discuss about the Soil Fauna The soil fauna inhabiting the soil are active partners of the soil flora in the decomposition of plant tissues.  When dead leaves fall on moist so

Enzymes of intestinal  juice Aminopepetidase is an  exopeptidase and cleaves peptide bonds next  to N-terminal amino acids of polypeptides and oligopeptides (unlike carboxypept

What is granite? Granite is a solid, igneous rock. It is formed by mica, quartz, feldspar and sometimes bits of other rocks as well. Granite is generally pink, white, or grey..