![]() Macro-nutrients provide calories and energy.Macro-nutrients are also called energy providing nutrients.Macro nutrients are the nutrients that are required in larger quantity by the body.On the basis of quantity required by the body:īased on the quantity required by the body, nutrients can be divided into two types: This classification exhibits and focuses on the importance of wide variety of nutrients and the need for nutritionally balanced diet.Ģ.This classification reveals that protein-energy malnutrition is not solely responsible for poor growth but it (poor growth) is also the result of other nutrient deficiencies which may not be identified and so appropriately treated.Importance of Type I and Type II classification: ![]() Examples of Type II nutrients whose deficiency in the diet results in growth failure are: protein, zinc, magnesium, phosphorus and potassium.Protein and energy (derived from carbohydrate and fats) are classified as type II nutrients.An animal can die from zinc deficiency even though it has a normal concentration of zinc in its tissues, but it can respond rapidly to small amount of dietary zinc.Additionally, during severe deficiency, the body might break down its own tissues followed by reduction of appetite. In Type II nutrient deficiency, growth stops, the body starts to conserve the nutrient, and its excretion falls to very low levels. ![]() Moreover, there are no characteristic symptoms to distinguish which type II nutrient deficiency an individual has.Therefore, it is necessary to note that the deficiency of type II nutrient does not show any physical signs or clinical symptoms and is difficult to identify.Type II nutrient deficiency induces preservation of plasma and tissue levels even at the expense of growth, repair and immune system.The concentration of zinc in the major tissues remains normal and there are no deficiency signs. Example: if a diet is deficient in type II nutrient like zinc, growth stops, followed by weight loss.Type II nutrients are those nutrients whose deficiency results in reduced growth or weight loss.Xerophthalmia (vitamin A or retinol deficiency).Scurvy (vitamin C or ascorbic acid deficiency),.Pellagra (niacin or nicotinic acid deficiency),.Examples of Type I nutrient deficiency are:. ![]()
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