How to Read Your First Two Weeks of CGM Data on a GLP-1
“It is better to discuss how far you have walked than how little you have eaten.”
The first time you wear a CGM, the data can feel like a stock ticker for your body. The trick is knowing which lines to watch and which to ignore. Here's a plain guide to your first two weeks, so you spend them learning instead of worrying.
Days 1 to 3: let it settle, don't judge yet
New sensors often need a short warm-up and can read a little off for the first day as they settle. So resist drawing conclusions right away. Use these first days to get used to the app, learn where your numbers usually sit, and notice the basic rhythm of your day. You're calibrating your own expectations more than measuring anything final.
The three numbers that actually matter
Your app will show a dozen metrics. Three carry most of the meaning early on.
Time in range is the share of the day your glucose sits between 70 and 180 mg/dL. Higher is generally better, with above 70% a common reference target. Watch it as a weekly trend, not a daily grade.
Time below range is your safety number, the share of the day under 70. You want this low. It matters most if you also take insulin or a sulfonylurea, in which case any pattern of lows is worth flagging to your clinician.
Your average and your variability together tell you not just where your glucose lives but how much it swings. A steady average beats a jumpy one even at the same number.
What's normal, and what's worth a note
A rise after meals is normal, and it should come back down over a couple of hours. A gentle overnight line is a good sign. Some day-to-day difference is expected, since food, stress, sleep, and activity all move glucose.
Worth a note, not a panic: peaks that stay very high for a long time after eating, repeated lows, or a variability number that keeps climbing week over week. These are conversation starters for your next visit, not emergencies on their own.
Tie the numbers to your day
The fastest way to learn is to connect a curve to a cause. When you see a spike, look back at what you ate and did. When you see a smooth stretch, notice that too. On a GLP-1, you'll often watch your post-meal peaks soften over these first weeks, which is the drug doing its visible work. A short daily glance, plus one weekly look at the trend, is plenty. You don't need to stare at it.
Turn your first two weeks into a clear picture
The learning curve is real, and it's faster with help. Endobits reads your first two weeks for you, points out what's normal versus what to watch, and turns the firehose into a plain-language picture of how your glucose is doing on a GLP-1. Start with Endobits →
Sources
- Battelino T, Danne T, Bergenstal RM, et al. Clinical targets for continuous glucose monitoring data interpretation: International Consensus on Time in Range. Diabetes Care, 2019. 10.2337/dci19-0028