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The U.S. Department of Agriculture recommends children ages 9 and older and adults consume at least 3 cups from the dairy group each day. Active teenagers with high calorie requirements of 3,000 calories or more may require 4 cups from the dairy group each day.
Children need between five and eight cups of water each day, according to a study led by researchers at Queens College of the City University of New York and published in the October 2010 issue of the American Journal of Clinical Nutrition..