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lactase deficiency, lactase nonpersistence, lactose intolerance, nutritional counseling



  1. Carter, Sherry L. PhD, RN, WHNP-BC
  2. Attel, Susan MSN, BSN, FNP


Approximately 70% of the world's population is lactase deficient. This article reviews the evolutionary history of lactase deficiency, recent recommendations to establish screening, and clinical practice guidelines for increased diagnosis of this important, yet often misunderstood condition of malabsorption.