Does trying to live healthy make sense considering an imminent bird flu outbreak?

[FlatAssembler]

Claims like a vegan or veggie diet boosts the immune system, and that in turn will prevent COVID-19.

Well, I have heard some scientists claiming that, and I haven't heard any claiming otherwise. Therefore, I conclude that is the scientific consensus.

The ability of anyone, yourself in particular, to be able to imagine (I think you actually mean understand) a concept has literally nothing to do with its basis in fact.

No, I did not mean understand, I meant imagine. A rock bleeding is hard to imagine, because it obviously goes against what we ordinarily experience.