BODY as fat or glycogen whereas 70% of it


Obesity is one phenomenon that is
very common in today’s society. Obesity is a big health concern because it can
lead to many medical problems. Humans being heterotrophic organism depend on
other organism for their food and nutrition.
Proteins, fats and carbohydrates constitute the old “nutritional
trinity” which Sdespite the recent emphasis on trace nutrients, are still
the most important cwponents of the diet, for without substrate, there is
little significance in catalysis. Fortunately the balance between these
components of the diet is not often critical; that is, the body metabolism is
geared to handle widely different types of diet. One must, of course, provide
the required quantities of the indispensable amino acids, and essential fatty
acids and sufficient additional nitrogen to provide for the dispensable amino
acids, nucleic acids, etc, as will undoubtedly be discussed by Dr. %stelic and
Dr. Vhite. trinity” can provide energy f o r v i t a l body processes and
biosynthesis, typical diet contains primarily carbohydrate, ample or excess
nitrogen but often insufficient amounts of certain essential amino acids, and
extremely variable quantities of fat. A calorie of energy in fat is essentially
equivalent in the body to a calorie in carbohydrate, although there may be
differences in the metabolites which accwrmlate in the body as will be
discussed later. A calorie fmm protein, when corrected for the fact that the
mino acids are not completely oxidized in the body (i.e., urea is excreted), is
also essentially equivalent. the various nutrients are supplied in proportions
to provide the body with absorbed nutrients which just meet the metabolic needs
of the body at that Beyond this, all three components of the “nutritional
The The “best-balanced” diet is one in which Our diet consists mainly
of  bio molecules such as fats, carbohydrates
and protein. These bio molecules are broken down into free fatty acids and
glycerol, glucose and amino acids respectively to give energy.

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Glucose is the main source of
energy for major metabolic pathways. Our brain depends mainly on glucose for
its activity. Only 30% of the food intake is used as depositories as fat or
glycogen whereas 70% of it is used in metabolic pathways. When excess
carbohydrate is taken than required in the body, then these glucose molecules
are stored in the form of fat by lipogenesis in adipose tissue or as glycogen
by glycogenesis in liver.

Fats on the other hand release a
large amount of energy as compared to carbohydrates. These upon breakdown by
lipolysis give rise to free fatty acids which are used in tissues for various
metabolic pathways.


Proteins are building block of our
body and regulate all the metabolic process. When excess protein is taken in
diet then that is