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Nutrition is the study of how food and drink affects our bodies with special regard to the essential nutrients necessary to support human health. It looks at the physiological and biochemical processes involved in nourishment and how substances in food provide energy or are converted into body tissues. These nutrients, which are the source of energy for our bodies, are classed as: carbohydrates, fats, fiber, minerals, proteins, vitamins and water. Good nutrition means obtaining the right amount of nutrients from healthy foods in the right combinations. An important part of the study of nutrition is looking at diseases that can result from malnutrition and the role that food plays in the development of chronic disease.