About 75 % of the world’s population is lactose intolerant. Let’s not kid ourselves: Lactose intolerance is very common, in fact, it’s the norm. Now you’re probably asking yourself why you have to explain to others – again and again – why you’re avoiding this particular milkshake or other dairy product. It’s because lactose intolerance does not affect the majority of Central Europeans. To understand this, one has to go back far in history.