Lactase persistence is where the body cannot digest dairy products of any sort, in any form. Lactase itself is a protein that appears in one of our allele genes that breaks down sugar. For those who have this gene issue, they are moderately known as lactose intolerant, due to the fact that they can’t process the sugar in dairy products, or derivatives of it. Centuries ago, this would have been considered normal, but over time that quickly vanished. During the Neolithic era, many Northern European adults began to drink milk at some point and could process it better than others. This soon populated with many other adults, and developed into a gene mutation. As humans learned more about this mutation, they labeled it as a mismatched disease because
