Are you for real? Hyponatremia is defined as your sodium/water level dropping below 135 mM sodium. This can happen one of two ways, too much water, or not enough salt. It’s a relationship. You can be dehydrated and hyponatremic at the same time. If you are sweating you lose sodium, you get that right? During endurance activities, especially in hot weather, one generally sweats off about a liter of water + 910mg of salt. To prevent dehydration you must replace those fluids. And to prevent hyponatremia you must replace the salt too. The point is to maintain the 135mM balance. In comes NUUN. For short activity usually not a big deal, but if you’re an ultra runner or engage in other high endurance activities (like me) it’s a big deal. I’ve competed in multi-day races where people have died from hyponatremia because they didn’t replace their sodium. Drinking gatorade works, but the problem with it is all the sugar. Do the math. If you’re involved in a multi-day 24 hr nonstop event where you’re sweating about 1L/hour that adds up to a lot of water and salt. If you drink nothing but gatorade that means a ton of sugar carbs that you don’t want over such a long period of time. You can’t live on sugar for a week and keep feeling or performing well. So instead you use sugarless salt tabs like Nuun combined with more normal healthy foods for your energy sources.

I guess that’s reason for concern :)