When you work up a sweat, it's not just your body's fluids you're depleting, but also its salt reserves. It may be that, if you've ever run a substantial distance in the summer heat, you'll have noticed not only the taste of salt in your sweat but possibly deposits of the stuff forming on your body too.
Salt gets quite a bit of bad press and it's true that it's not great for us in large quantities. However, we also need at least some of this essential nutrient to help the body to function properly. Nutritionists advise replacing lost salt after exertion, but what about during a run?
