So a quarter of medical consultations related to elders and heat was for a lack of salt [0]. From Google translate it’s call hyponatremia.
So as stated in other comments, moderation, may be, lack, bad idea.
I’m actually in Ireland. They seem to have taken the salt part very seriously, as everything need to be resalted (for me and my family). But everything is over sugared.
[0] https://www.nouvelobs.com/societe/20180806.OBS0591/canicule-... (in French)
Edit : typos