The physiological (internal) drive to find and eat food is known as Hunger.
Hunger is an unpleasant or painful physical sensation caused by inadequate intake of food energy. It becomes chronic if you do not regularly consume enough calories (dietary energy) to lead a healthy, normal life. Poverty is the main cause of global hunger. The unequal distribution of income and scarcity of resources in developing countries means that millions of people cannot afford the land and agricultural products they need to grow themselves and have access to nutritious food.
Hunger slows development on a cognitive, social, and emotional level. These include reading, language, attention, memory, and problem-solving skills. Need interferes with our ability to concentrate and learn.
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