[mlyle]

> As I said, at what point or how much evidence is need to heed such advice.

This is like a Pascal's wager. There's a bazillion things we could be doing that there's a little evidence for or a plausible explanation. And we can't do them all, or believe in every God, or whatever.

And even things that we had a lot of evidence for (like dietary fat) turned out to be harmful when given as public health advice.

In the end, things are tricky. Best to do whatever seems like it's reasonably careful to you, and for science to try and figure more of this out and decide the best things to give advice on.