Sweat is made up of water and minerals that are collectively known as electrolytes. Chris Hunkeler/Flickr, CC BY-SAElectrolytes are an important part of normal human function. The failure to maintain a normal balance of electrolytes can lead to dehydration and possibly heart and neurological problems. When we’re physically active, either as a regular part of the day or when exercising, our bodies produce heat. So we start sweating to prevent overheating. Loss of water in this way can lead to dehydration, but failure to prevent overheating by sweating can result in dizziness, thirst, headaches, nausea, muscle spasms, cramps, fatigue and disorientation. The human body can produce up to two litres of sweat in an hour, although this amount is highly dependent on environmental conditions as