I don't know why, but I don't sweat much. But I do sweat. I've taken some bike rides in the summer and felt absolutely awful. It turns out I was salt-depleted. Now when I take a long ride in summer, I am careful to carry salt with me. It turns that awful feeling around rapidly. Usually, we have to be careful not to have too much salt. My blood pressure is rising, so I'm careful not to put too much in my food. But when sweating, it's a different matter.