We evolved in a low salt environment and our bodies are actually very good at holding onto salt - which creates problems in Western society as many foods contain a lot of salt - bread/cereals/crisps are the obvious ones but there are plenty more - you would have to try pretty hard with your diet to not get enough salt. Sweat contains more water than salt - it only tastes salty as the water evaporates, and kidneys can cut salt excretion to close to zero when necessary. Hunter gatherers manage on well under a gram of salt a day, and they do quite a bit of exercise ..... the more salt you eat, the more your body will excrete in urine/sweat - and the chances are the higher your blood pressure will be. I realize this will be an unpopular post with some ....