Caloric consumption is highly individualized. The ADA (Am.Dietetic Assoc.) states that most adults should consume approximately 2,000 cal./day. In the U.S., a vast majority of people consume more than this every day. Determining factors of intake include gender, body frame, age, and activity level.
As a general rule, we need less calories per day as we get older, metabolism slows down a bit, as does activity level. However, some older adults lead a very active lifestyle and so caloric intake would vary. Also, people that do physically challenging work would need a higher amount of calories because they burn more than the person who sits at a desk all day. Activity level is probably the biggest determinant of caloric needs.
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