It is a common misconception that you need salt when you exercise and sweat a lot. You absolutely do not need salt.
this post was submitted on 04 Jul 2023
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That's a very incorrect statement. NaCl, KCl, and MgCl2 are essential for our bodies to function appropriately. If you are working out for an hour or mowing the lawn on a hot day, you are mostly correct. You can replace the lost salt though a balanced diet. If you have sustained sweating, such as when you run a marathon or play a match of football, it can be deadly to not replace these salts.
In the vast majority of cases, people don't need salt when they exercise. You just described a fringe case that virtually no one experiences. You high school football coach shouldn't be giving you salt. That could be dangerous. They should be giving you water.
The coach won't be giving them salt directly, but will always provide a sports drink which contains salts.
Ever watch any sport and a player falls over with a cramp? They have drunk too much water and not enough electrolytes.
Here's a study from one hospital in Oslo, Norway. Norway is not considered a hot region of the world. Between 2010 and 2015 they treated 31,000 patients in the ER from a population of 135,000 for electrolyte imbalance. That's roughly 18 patients a day. This is not some sort of fringe case.
This was the response I got from Perplexity.ai.
The tl;dr is from there, too:
Dehydration can lead to death through mechanisms such as organ failure, blood thickening and reduced blood pressure, electrolyte imbalance, brain swelling, shock, and build-up of cellular waste.
Electrolyte imbalances and upset balance of salts and sugar can cause impaired cellular function, heart problems, neurological issues, kidney damage, and shock, ultimately leading to death.