I have looked into this and cannot find much information at all. I have had a lung transplant, and have to take anti rejection meds for the rest of my life. I have been on LC for one week today. I bought test strips, and they do not turn purple, but I have lost 4 pounds. (water weight, I know) I asked my pharmacist and he said unless I was taking diuretics, LC diet would be fine. I am going to stick to it, and see what happens for awhile. I feel horrible, on this diet, I hope that part of it gets better...