4th Pediatric Infectious Diseases Conference
 
 
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NUTRITION IN CHILDREN
NUTRITION FOR HEALTHY GROWTH AND IMMUNITY
Nutrition for Healthy Growth and ImmunityNutrition for Healthy Growth and Immunity
Nutrition for Healthy Growth and Immunity
Children are not small adults. They are constantly growing, developing and maturing from a neonate to a full grown adult. Thus optimal nutrition is required to meet with the demands throughout this period so that full genetic potential can be realized.(1) Growth is the most commonly used functional outcome measure of nutrient adequacy.(2) Childhood growth not only involves increase in body size but changes in body proportions, the relative sizes of organ systems and chemical compositions.(1) Epidemiologic data clearly show that patterns of growth in fetal life and infancy are correlated with later risk of cardiovascular disease and the metabolic syndrome.(1)Thus optimizing nutrition in early life has a relevance to long term health.

Normal pattern of growth can be defined in the form of growth reference compiled by measuring normal healthy children. The data obtained may be reproduced graphically in the form of growth charts (such as NCHS, WHO, Agrawal growth chart) or be transformed into properties of a normal distribution as z-scores (such as WHO z scores). Weight, height (or length) and head circumference are most widely used parameters clinically though other references commonly used are skin fold thickness, mid arm circumference.(1) The pattern of growth can be resolved into infant, child and pubertal phase based on endocrine influences.

Infant growth is primarily nutrient/insulin led, an extension of fetal pattern whereas childhood growth is predominantly growth hormone led and pubertal growth is driven by influence of sex steroids. Growth is affected by numerous factors including poverty, ethnic background and emotional well-being(1), Deviation from normal nutrition pattern can lead to over-nutrition (obesity) or under-nutrition (PEM).

During infancy by 1st year of life the child increases in weight 3 fold and by 50% in length and in head circumference by 10 cm. The growth rate slows in the 2nd year of life and head circumference increases by 2 cm over the year and by 24 months, children are about half of their ultimate adult height. From 2-5 years of age, weight gain occurs about 2 kg/year and height increases by 7-8 cm/year. Head grows an additional 5 cms between 3-18 years. From 6-11 years, weight gain averages 3-3.5 kg per year and height increases by 6-7 cm per year. During adolescence, secondary sexual characters develop with acceleration in growth velocities with increase in lean body mass to 90% in boys and decrease in girls to 75% as subcutaneous fat accumulates. Weight gain parallels linear growth with a delay of several months.(3)
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