Not surprisingly, experiences like mine with dairy, outlined in my column of two weeks ago, are more common than unusual, at least according to the roughly 1,300 comments and e-mails we received since then. In them, people outlined their experiences with dairy and health problems as varied as heartburn, migraines, irritable bowel syndrome, colitis, eczema, acne, hives, asthma (“When I gave up dairy, my asthma went away completely”), gall bladder issues, body aches, ear infections, colic, “seasonal allergies,” rhinitis, chronic sinus infections and more. (One writer mentioned an absence of canker sores after cutting dairy; I realized I hadn’t had a canker sore — which I’ve gotten an average of once a month my whole life — in four months. Something else to think about.)
Although lactose intolerance and its generalized digestive tract problems are well documented, and milk allergies are thought to affect perhaps 1 percent of the American population, the links between milk (or dairy) and such a broad range of ailments has not been well studied, at least by the medical establishment.
Yet if you speak with people who’ve had these kinds of reactive problems, it would appear that the medical establishment is among the last places you’d want to turn for advice. Nearly everyone who complained of heartburn, for example, later resolved by eliminating dairy, had a story of a doctor (usually a gastroenterologist) prescribing a proton pump inhibitor, or P.P.I., a drug (among the most prescribed in the United States) that blocks the production of acid in the stomach.