In short I never feel hydrated and seem to be thirsty quite a lot. I have been checked for Diabetes so can rule that out. I drink at least 5 litres of water a day, sometimes more. Diet is ok, not perfect though. Don't take any drugs which could put stress on my kidneys but I can sometimes drink loads without needing a wee and when I do its very dark. Hardly ever goes clear no matter how much I drink. Kidney function is fine also so i am really scratching my head. Have not had alcohol for a few days and the problem persists Anyone got ideas?