I would definitely not drink milk directly from a cow. That is something I leave to conservative idiots in the US.

As for artificial sweeteners, there are dozens of peer-reviewed studies on the dangers, and some of those chemical have already been taken off the market. Biological / pharmaceutical research has mastered to single out threats from single components long ago, so if they come to the conclusion that aspartame or others are bad, they have good reason to believe it actually was that components fault.