Hydration is a salty science
Contrary to popular belief, more of this amazing mineral is better than less. Between losses during exercise, heat, daily activities and modern lifestyle factors - such as coffee, medications, alcohol and sitting in constant air conditioned rooms, as well as a diet lacking in sodium, it's a recipe for some pretty nasty symptoms. According to a 2011 JAMA Study, 4-6 grams of sodium was the optimal amount per day to minimise heart attack and stroke risk. This is a baseline for most people not including the sodium they may lose throughout the day.