...Such a mutation is known to have arisen among an early cattle-raising people, the Funnel Beaker culture, which flourished some 5,000 to 6,000 years ago in north-central Europe. People with a persistently active lactase gene have no problem digesting milk and are said to be lactose tolerant.
So what was the first thing that I thought of? Yeah.
Like I said, I need an intervention, since I'm obviously disturbed and in need of serious help.