I have the same situation as above. I drink plenty of water and keep my carbs at 20ish - yet my strip is purple. It was mauve on day one so there was a measurable difference.

Yesterday I ate a huge soft pretzel for lack of anything else around. I also scarfed some honey roasted nuts and a few slurps of soda. We were at the pool and there was nothing attractive at the snack shop to eat. That night my color dropped to mauve again. When I woke up this morning it was purple.

Today I'm getting a scale to see what is going on. I think this may be a case of different strokes for different folks. If people can lose weight just fine with the slightest reading, and we are showing a strong reading while also observing the rules, what are we supposed to do?