Download MBBS Nutrition Lecture PPT

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


INTRODUCTION

Nutrition is best defined as the composition and

quantity of food intake and utilization of the food by

living organisms

Study of human nutrition can be divided in to three

areas i.e under nutrition, over nutrition and ideal

nutrition

Various dietary components required for optimal

nutrition are carbohhydrates,lipids ,proteins,vitamins

and minerals
Importance of Carbohydrates

The dietary carbohydrates provide a major fraction of

the body's energy needs

Ideally carbohydrates may provide about 60-65% of

the total calories

The carbohydrates in diet may be available or

unavailable

The available carbohydrates can be metabolized by

the body to give energy e.g. starch

The unavailable carbohydrates can not be assimilated

and constitute only the dietary fiber.



Dietary Fiber

The unavailable or indigestible carbohydrates in the

diet is called dietary fibre

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

carbohydrates that have beneficial physiological

effects in humans

Dietary fibers have different chemical and physical

properties

They have been mainly classified in to two types

1.Soluble
2. Insoluble



Importance of dietary fibers

Cellulose , hemicellulose and lignin absorb water and

increase stool bulk and thus decreases intestinal

transit time and are associated with the effect of fiber

on regularity

They decrease intracolonic pressure and appear to

play a beneficial role with respect to diverticular

diseases

By diluting out potential carcinogens and speeding

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

viscous gels in stomach and small intestine and slow the

rate of gastric emptying,thus slowing the rate of

absorption of cholesterol and carbohydrates

Pectin and gums bind bile acids and increases their

excretion and thus lowering the cholesterol level in blood

Fiber rich diet being indigestable giving a feeling of fullness

without consumption of excess calories and thus prevent

us from obesity and its associated complications


This post was last modified on 30 November 2021