"As the West advances civilization with medical research that results in better health and longer life spans, Islamic health norms pull civilization backwards. And as the Muslim population in the West rises, the health implications are profound.
Let’s start with what is likely the greatest blow to human development: inbreeding. Muslims do a lot of it. In fact half of the world’s Muslims (about a billion of them) are inbred. And many of those are the product of generation after generation of inbreeding, which further compounds the genetic impact."[American Thinker]