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Article: Sour on milk.(lactose intolerance)(Brief Article)
- Article from:
- U.S. News & World Report
- Article date:
- January 21, 2002
- Author:
CopyrightCOPYRIGHT 2002 All rights reserved. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Thousands of years ago, humans could not digest lactose, the sugar in milk, once they were weaned. A genetic mutation changed that for northern Europeans and others who depended heavily on dairy products. But in much of the world's population, including 30 million to 50 million Americans, lactose can cause cramps, nausea, and diarrhea. Now researchers have found the DNA variant ...