dave54 wrote:Do you mean a glucose drink or electrolytes?
Most tend not to need electrolyte supplements. Many, if not most, benefit from a glucose (sports) drink.
Nope, I mean electrolytes. Sports drinks are designed to provide three things: water, carbohydrates, and electrolytes. Sure, most people won't get sick or pass out if they go hiking without electrolyte supplements as long as they have food, but that doesn't mean they won't benefit from them. Most people won't get sick if they under-eat when they're backpacking either, but they sure will have more energy and feel better if they eat properly. Taking a salt pill when I've been hiking for a few hours in warm weather wakes me up about as much as a small cup of coffee. I've persuaded friends to take them when they're out hiking with me, and they were convinced enough to order their own bottles when they got home.
I really do require more electrolytes and more water than most people, so salt pills make more of a difference for me, but I feel like a lot of hikers would still benefit from them. Just one or two a day would probably be fine for most people if they are snacking. At that rate, you're looking at an extra 0.5 grams per hike, and a $10 bottle that will likely last 2-3 years.
BTW, symptoms of mild hyponatremia can mimic heat exhaustion: fatigue, general feeling of being unwell, and nausea. For most people, it starts off with feeling tired. With advanced hyponatremia, your intestines can't absorb the water you drink, so it just comes out the other end. Water can even leach from your intestine walls into your GI tract and make you sprint for the nearest bush or large rock to hide behind while you drop your trousers. The more severe case is why I won't be going back to that Meetup group that I won't name.