hey smilinka,

One thing I have noticed with the ketostix is that if you drink alot of water, they show up as pale, pale pink to neutral. When I don't get all the water I should, they tend to be really deep purple. My diet doesn't change at all, so I have concluded I am in ketosis and am probably producing the same amount of ketones, but my urine is so diluted from all the H2O that they don't register. Hope that helps some. It may be the case for you since I see you drink alot of water, which is great!