Thanks, @windyshores. let me know what you find out. Meanwhile, the explanations you listed so far sound feasible to me. I don't have a problem with low blood pressure so I would continue limiting salt. But I do worry about muscle loss because I don't think I consume enough protein, as I've been on a vegetarian diet. I have consulted with a dietician, but I haven't been able to incorporate them...things like soy and tofu. She also mentioned Greek yogurt which I used to eat years ago. I went out and bought some but never ate it. Not sure why. Right now, my main source of protein seems to be nuts, and to a lesser extent cheese. But I have to limit how much I consume of both of those. Any suggestions?