Lactase deficiency; Milk intolerance; Disaccharidase deficiency; Dairy product intolerance
There is no known way to prevent lactose intolerance.
If you have the condition, avoiding or restricting the amount of milk products in your diet can reduce or prevent symptoms.
Genauer CH, Hammer HF. Maldigestion and malabsorption. In: Feldman M, Friedman LS, Sleisenger MH, eds. Sleisenger & Fordtran's Gastrointestinal and Liver Disease. 9th ed. Philadelphia, Pa: Saunders Elsevier; 2010: chap 101.
Lactose intolerance. The National Digestive Diseases Information Clearinghouse (NDDIC). NIH Publication No. 09-2751. June 2009.