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
Define the Lymphocytes They are agranulocytes. The nucleus occupies approximately the entire cell. They vary in size from 6- 18 mm diameter; sometimes divide in small and large

What is ablation? Ans)  Ablation is a technological term for the loss of snow and ice from a glacier. The process happens by a combination of the two physical processes, meltin

Explains Osmotic Pressure – Functions of plasma proteins Plasma proteins exert an osmotic pressure of 25 mm Hg, which helps in maintaining plasma volume. The osmotic pressure e

Spinal Cord: The spinal  cord extends downwards from the  brain stem through the  protecting bony rings called vertebrae down the  centre of  the backbone, to the bottom of the

Explain Carbamoyl Phosphate Synthetase (CPSI) ? In the first step, the mitochondria1 enzyme Carbamoyl Phosphate Synthetase 1 converts the ammonia produced by glutamate dehydro

Explain Role of the Mucous in Body Systems and Organs - The gastrointestinal tract: The microbes which enter through the mouth are caught in the mucous and eliminated with sput

Define the term Blood “The ancients believed that blood was the seat of the emotions".  Blood, a body fluid, has been correctly termed as an elixir of life. We all have blood

Exploration of resources Exploration of resources  involves complex techniques which depend on the physical, chemical and biological properties of a particular resource. Now

Question 1 Define Eco-labelling. Explain the environmental importance of eco-labelling with examples Question 2 Discuss the elements of environmental roadmap for eco

Explain the Gynaecological morbidity Gynaecological morbidity, which covers any condition, disease or dysfunction of the reproductive system that is not related to pregnancy, a