Is it OK to drink something during a meal? This is a question raised particularly by parents of young children, many of whom were taught by their own parents that you shouldn’t drink anything until after a meal. The rationale is that ingesting fluids dilutes stomach acid, disturbing digestion. Is this true? “There is indeed a kernel of truth in that,” says Johannes Georg Wechsler, president of the Federal Association of German Nutritional Physicians (BDEM). “If you drink a lot during a meal, you do in fact cause a dilution of stomach acid.” He doesn’t advise drinking nothing at all while you’r…