Learning a lot about CGM in the Data Driven Fasting group.

CGMs are not measuring your blood glucose: which is the desired format if you want to do the [DDF] challenge correctly. So yes: you should be checking your BG with a finger prick. There is no “easier” method available at this time for BLOOD glucose.

So...what is a CGM you may be asking yourself? A CGM measures interstitial fluid (the liquid that lies just beneath the skin). Because it can take 20-40 minutes for glucose to travel through your veins to change the glucose levels under the skin - your CGM readings will rarely if ever match your BG exactly. (Unless your BG has been the same for the last hour or so). Yes, it’s fantastic for showing you trends: i.e. whether your glucose is rising or steady or falling. But make no mistake. It’s not Blood glucose which is the most reliable.