I'm sure it depends a lot on your personal metabolism, but for me it doesn't matter whether my ketostix are pink or deep purple...I lose pretty much the same amount of weight in a week (assuming there's no sudden carb increase). Some days show more loss than others, but since I am charting a weekly average of daily weights I noticed that for me there hasn't been a huge difference. So, in my humble opinion, if your stix are coloured and the scale is dropping then go ahead and be HAPPY!!!

As a precaution against dehydration (if you're concerned) just be sure to drink as much as you need to to feel well, but don't force fluids either.