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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.
Teenagers should eat about 3 cups of dairy foods per day. One and a half oz. of cheese -- a piece about the size of two dominoes -- is equivalent to 1 cup of dairy. Any type of cow's milk will suit the dairy requirements, but low-fat milk is the healthiest choice.