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Desires, aspirations and preferences are subjective elements of demand and they express attitudes or positions that occur at individual level. Though the needs are few, a human's desires are very different and they occur on a permanent basis modelled by social forces and institutions. Though each individual has his/her own features, research shows that the need for food consumption varies depending on several individual (genetic heritage, age, sex, body size, physiological states) and environmental (physical, biol...