If you have no trouble digesting milk products, you're actually in the minority. That's why scientists don't like the term lactose intolerance, because it gives the impression that it's a disease. Lactose tolerance is actually a genetic mutation. It may have to do with the fact that thousands of years ago, depending on where people lived, milk was a source of food, calcium, and vitamin D. So people kept drinking cow's milk even after they stopped nursing (breast milk also contains lactose), and their bodies continued to produce the lactase enzyme to break it down. That's why there's a connection between your nationality and your sensitivity to milk. Those of European, Irish, Dutch, and Scandinavian decent are usually more tolerant of milk, while Native Americans, Asians, and those of African and Caribbean decent are more sensitive.
Tell me, where do you stand when it comes to sensitivity to milk?