Your sweat holds a lot of information about the state of your health Ryan Pierse/Getty Images
“Wow, you’re quite salty,” says Stefan van der Fluit, looking over my numbers. I could have told him that. I have just done a sweaty, 45-minute workout on an exercise bike and the salt is already starting to crystallise on my T-shirt. But van der Fluit knows exactly how salty. I have just sweated out 347 milligrams of sodium in 370 millilitres of water. That’s on the high side, sodium-wise, and I need to replenish.
Van der Fluit is the co-founder of a company…
