Presentation on theme: "What is nutrition The word 'Nutrition" comes from a Latin word which means to 'nourish" or to "to feed". Nutrition covers many areas including: the science."— Presentation transcript:
What is nutrition The word 'Nutrition" comes from a Latin word which means to 'nourish" or to "to feed". Nutrition covers many areas including: the science of food why people/animal choose certain foods what foods are made of the nutrients in foods how the body uses food food digestion food functions
Food composition What are foods made of? Carbohydrates Proteins Fats Vitamins Minerals Water
Carbohydrates Carbon, hydrogen and oxygen Ratio H:O = 2:1 similar to water Acetic acid, lactic acid, deoxyribose, rhamnose Polyhydroxy aldehide or polyhydroxy keton Primary function: – Source of energy Located in plant and animal tissues – Simple carbohydrate- starches (grains) – Complex carbohydrate- cellulose (component of cell walls)
SOURCE OF CALORY – 55-60% of caloric intake – 1 gram yields 4 calories Carbohydrates
Carbohydrates Complex carbohydrates 1.Cellulose Ruminants require microbial fermentation to break down complex carbohydrates
Carbohydrates Carbohydrates come from plant foods. They are the cheapest and most plentiful of all nutrients. Foods, which contain carbohydrates, are called energy foods. Carbohydrates are classified into three groups: Sugar Starch fiber
Sources of carbohydrates Sugars are found in honey, fruit (both fresh and dried) soft drinks, milk and sugar. Starches are found in cereals, pasta, flour, bread, potatoes, root and pulse vegetables. Fibers are found in fruits, vegetables and whole wheat bread.
Functions of carbohydrates Carbohydrates provides the body with heat and energy. Fiber helps the movement of food through the intestine. Fiber rich and starchy foods provide a "full feeling". Carbohydrate deficiency: Carbohydrate deficiency diseases rarely occur, as carbohydrate is present in a wide variety of foods. Starting material for synthesis of other type of compound e.g. fatty acid and certain amino acid Structure of: glycolipid, glycoprotein, nucleic acid
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