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Body needs vary within individuals for maintaining a stable metabolic function. Metabolic function is defined as how quickly a body uses energy - in this case how many calories it uses per day to maintain function. Between 2000-2500 calories per day is considered an average amount of calories needed to keep your metabolic rate in constant and consistent activity. Adding 1000 extra calories per day is gaining weight at 2 pounds per week. Some caloric needs may exceed 2500 calories per day; the key is to increase the needed calories by at least 1000 calories per day, since you need calories to gain weight.