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Download MBBS Nutrition Lecture PPT

Download MBBS (Bachelor of Medicine and Bachelor of Surgery) Latest Nutrition Lecture PPT

This post was last modified on 30 November 2021


INTRODUCTION

Nutrition is best defined as the composition and

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quantity of food intake and utilization of the food by

living organisms

Study of human nutrition can be divided in to three

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areas i.e under nutrition, over nutrition and ideal

nutrition

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Various dietary components required for optimal

nutrition are carbohhydrates,lipids ,proteins,vitamins

and minerals

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Importance of Carbohydrates

The dietary carbohydrates provide a major fraction of

the body's energy needs

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Ideally carbohydrates may provide about 60-65% of

the total calories

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The carbohydrates in diet may be available or

unavailable

The available carbohydrates can be metabolized by

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the body to give energy e.g. starch

The unavailable carbohydrates can not be assimilated

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and constitute only the dietary fiber.



Dietary Fiber

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The unavailable or indigestible carbohydrates in the

diet is called dietary fibre

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Fibres are also known as roughage or bulk
Functional fiber are isolated nondigestible

carbohydrates that have beneficial physiological

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effects in humans

Dietary fibers have different chemical and physical

properties

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They have been mainly classified in to two types

1.Soluble
2. Insoluble

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Importance of dietary fibers

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Cellulose , hemicellulose and lignin absorb water and

increase stool bulk and thus decreases intestinal

transit time and are associated with the effect of fiber

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on regularity

They decrease intracolonic pressure and appear to

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play a beneficial role with respect to diverticular

diseases

By diluting out potential carcinogens and speeding

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their transit through the colon, they may also play a

role in reducing the risk of colon cancer
Mucilaginous fibres such as pectin and gums,tend to form

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viscous gels in stomach and small intestine and slow the

rate of gastric emptying,thus slowing the rate of

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absorption of cholesterol and carbohydrates

Pectin and gums bind bile acids and increases their

excretion and thus lowering the cholesterol level in blood

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Fiber rich diet being indigestable giving a feeling of fullness

without consumption of excess calories and thus prevent

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us from obesity and its associated complications