Talk about taking the long view! While you're watching that I'll watch the rain making a new valley outside my window.

You jest but many Europeans have already evolved greater capacity to digest milk and alcohol than other races with less exposure.

You mean the inability to digest anything that hasn't been heavily machine processed to an extreme glycemic index? Granted, we required cooking of food to support the energy requirements of our large brains, but that's pretty much just a fire and a slab of meat. Is it really a good evolutionary path to depend on a whole industrial complex of food procesing machinery that is a big natural disaster away from being completely broken down?

You mean that people able to resist or live longer under such a diet will survive and that we will evolve to support such a died? If so, you are probably wrong.

It is not about survival it is about the ability to pass down genes. If the diet's problems appear later in life, it will not have a direct impact. It may have an indirect impact.

Starting to get off topic but I really don't think evolution is happening in humans anymore, at least in the first world. Sanitation, medicine, and surgery has advanced so far we've almost completely eliminated natural selection. In fact I'd be surprised if some "de-evolving" isn't happening.