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 What is nutritional disorders | Class 11 biology online notes  Class 11 biology :  Nutritional disorders or diseases are the physiological conditions that occur due to the lack of intake of the particular nutrients required by our body. We will discuss some of the deficiency diseases or nutritional disorders. Protein Deficiency Diseases Although severe protein deficiency is rare in the developed world, it is a leading cause of death in children in many poor, underdeveloped countries. There are two main syndromes associated with protein deficiencies:  Kwashiorkor and Marasmus . Kwashiorkor affects millions of children worldwide. The syndrome was named because it occurred most commonly in children who had recently been weaned from the breast, usually because another child had just been born. Kwashiorkor is characterized by swelling (edema) of the feet and abdomen, poor skin health, growth retardation, low muscle mass and liver malfunction. Diets extremely low in protein do n