Bernie Thimian, a spokesperson for the Toronto Vegetarian Association, explained in her 2003 article "16 Reasons Why People Avoid Dairy Products" accessed on The No Milk Page website:

“Until refrigeration came along, the vast majority of humans and animals on the planet consumed little or no milk products. Most Asians (more than 1 billion), most Africans (almost a billion), and many other cultures around the world still consume no dairy products.”