Not a specialist in the field, but I note the journal where both those papers appear, Medical Hypotheses, explicitly disavows peer review, and was founded by a fellow [1] who seems to have spent his entire professional life under something of a shadow. I'd take those hypotheses with a grain of salt. But, if I were feeling myself unduly miserable (which happens sometimes), I might also take magnesium supplements for a while just to see what effect it might have on my state of mind.

[1] https://en.wikipedia.org/wiki/David_Horrobin