I posted a thread about this too, and I still don't really understand. I know what ketones are. I just wonder what it means that I am testing between moderate and large or just plain old large ALL the time. I am testing before meals, so it is not from the fat I am eating. I drink so much water, always have, so it is no biggy for me to down 3 or 4 litres a day. More often then not I test dark purple. anyone??????