Originally Posted by Gourmet Greg
Q: All cheeses contain lactose, right?
No; all cow's milk contains lactose. I would have to check to see if every mammal's milk does, though it seems likely. Lactose (like all -ose's) is a sugar, which is consumed by the bacteria and fungi that turn fluid milk into cheese. Some cheeses have some lactose left, some almost none. Because lactose intolerance is in fact an intolerance, not an allergy, small quantities of lactose usually are not a problem for the intolerant. If a moderate amount of cheese causes the difficulty that one identifies with consuming milk, it is likely that the problem is not the lactose, but something else, assuming an overall good health otherwise. One would expect a person with for instance Crohn's disease, who was also lactose intolerant, to have a lower dose response. Having been and raised lactose intolerant kids, I would investigate further if an ounce of cheese caused an adult intestinal distress; there is probably something else going on as well.