Heya!
On Medifast, ketosis doesn't need to be measured. We go into a "mild" stage of it, not as high as those on say, Atkins.
Those little strips can be thrown off by many things, and are not necessarily any indication that you are not in losing-weight-mode. For instance, if you are dehydrated, your ketone level will appear to go "up" but really, your water level has just decreased and fakes out the strips. Same way in reverse - drink a lot of fluids - less ketone output
Plus, those strips cost mad money!
If you are losing and following your plan, don't worry about the purple and pink readouts
