Hypomagnesemia

Good morning everyone! I promise that this isn't a homework question but more of a "could someone clarify why?" question haha

So I'm taking pathophysiology now, and we're mowing through fluids and electrolytes, and for the most part I get it, but there's a few things that the book doesn't really explain well or at all - for example:

It says that DKA is a cause of hypomagnesemia, but it doesn't say why, just that it is. Would this be due to polyuria in the acidotic state? I'm trying to piece together the why so I understand the material - I don't want to just regurgitate things, I need to know the moving parts so I can see it mentally, if that makes sense.

A quick edit - If hypomagnesemia manifests with hypokalemia and hypocalcemia, would that mean that hypermagnesemia manifests with hyperkalemia and hypocalcemia? I'm still trying to figure out the "why" on that one - I want to figure out why they are all linked together, but that's going to take me a little time and resources :)

The rest of the stuff I don't get I'm still working on figuring out. I don't want to ask a question and not have my own idea of what's happening.

Thank you so much for your time, everyone!