Khalil Beckwith has never been formally diagnosed with lactose intolerance.
He just knows that drinking milk makes him feel lousy.
"When I drink milk with nothing else ... finishing the carton can be a nauseating endeavor," said Beckwith, a senior at King College Prep High School in Chicago.
Yet when Beckwith takes a meal through the federal school lunch program, milk is the only beverage available. Usually he avoids drinking it, but sometimes he said he feels pressure to take the milk. Then he either throws it away or winds up feeling queasy.