Does your breakfast bowl of Cheerios in milk not go down as easily as it used to? Do those big double-fudge ice-cream bars you love so much leave your stomach feeling queasy these days? If so, you may be suffering from an inability to digest lactose, the natural sugar found in dairy foods. Or maybe you have just swallowed one too many advertisements for Lactaid, Dairy Ease and other products that are heavily promoted as a remedy for milk-induced indigestion.
If you believe the industry, "lactose intolerance" plays intestinal havoc with as many as 50 million Americans. Even though many physicians...