We need food to grow and prolong life. We consume various types of food according to our age, work or lifestyle. Geography and socio-economic factors greatly influence the availability and consumption of food. NutritionNutrition is the food that provides energy and good health. The human body needs nutrition or nourishment on a timely basis.Nutrition science deals with the relationship between diet and health. Diet can be defined as the habitual nourishment intake. A balanced diet is needed to promote and maintain good health and longevity. It is vital for preventing chronic health risks, such as obesity heart disease, cancer and diabetes. Foods contain nutrients that help the metabolic functions in our body. Insufficient intake of these vital nutrients leads to improper functioning the body. This state is called nutritional deficiency. A healthy diet involves appropriate intake of all nutrients and water. Nutrients are chemicals that organisms need to live and grow. They are used to build and repair tissues, regulate body processes etc. Nutrients needed in very small amounts are called micronutrients and those nutrients needed in larger quantities are called macronutrients. Organic nutrients include carbohydrates fatsproteins and vitamins. Inorganic nutrients are water, dietary minerals and oxygen. Nutrients are also classified as essential or non-essential. If a nutrient is obtained from an external source when an organism is unable to synthesizedit internally or insufficiently it called an essential nutrient. Non-essential nutrients are those which can be synthesized by the body. Carbohydrates provide energy. They are compounds made up of sugars. Carbohydrates are classified by their number of sugar units: monosaccharides, disaccharides, oligosaccharides, and polysaccharides.
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