Human Nutrition Case Study

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Chapter 2 2. Theoretical backgrounds 2.1 Human body Food, water and oxygen are life-sustaining substance essential to human life. Food provides both energy and the material needed for body cells. Nutrients are nourishing substances in food. These are needed for growth and development from childhood to entire life cycle for maintenance of body functions (Aguilera and Stanley, 1999). Food, water and oxygen are life-sustaining substance essential to human life. Nutrients are nourishing substances in food. These are needed for growth and development from childhood to entire life cycle for maintenance of body functions (Krishnaswamy and Sesikeran, 2010, p 1f). 2.1.1 Chemical composition of human body The chemical composition of human body is…show more content…
It is a source of nutrient and provides the energy required for all activities of human body, as growth, repair of the damaged tissues, reproduction and sustenance (John, S. and Jenifer, J., 2008). Food is consumed to satisfy primarily hunger, which is an unpleasant sanitation, hunger is a physiological condition associated with the contraction of the stomach and leads to other sensations such as weakness, irritability and even nausea (Burchi, F. et. al, 2011). Food is also sought to satisfy the appetite, a pleasant sensation causing a person to satisfy the craving of the body or food. It is more of a psychological state usually felt in the mouth depending on odour and floor as well as the memory of a pleasant food (Shivasankar, B., 2009) Apart from being a source of nutrients and energy, food also gives a sense of security in the sense those individuals, communities and nations feet secure when enough food is stored to meet the requirement design scarcity periods (FAO,…show more content…
It supplies essential fatty acids and helps to absorb of fat-soluble vitamins A, D, E and K. Fat is essential for production of hormones , cognitive development and brain function in infancy and early childhood. Breastfeeding supply 40–50% of infant and children 's energy as fat (Fidler, et al., 1998). In human body fat can produce from endogenous metabolism and from ingested carbohydrate and protein. The metabolism of these three macronutrients such as fats, carbohydrate and protein and the consequences of dietary changes are interrelated. Our human body gets energy from intakes of carbohydrates and fat (Stephen, et
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