I've been wearing a Freestyle Libre 3 continuously for 18 months — 6 months before starting semaglutide and 12 months on it. The transformation in my glucose traces is genuinely dramatic. Summary statistics from LibreView: | Metric | Pre-Sema (6 mo avg) | Months 1-3 | Months 4-6 | Months 7-12 | Non-Diabetic Target | |--------|-------------------|-----------|-----------|------------|-------------------| | Mean Glucose | 148 mg/dL | 128 mg/dL | 112 mg/dL | 96 mg/dL | 80-100 | | Time in Range (70-180) | 62% | 78% | 88% | 96% | >70% | | Time Above 180 | 28% | 14% | 6% | 1.2% | <5% | | Time Below 70 | 1.8% | 1.4% | 0.8% | 0.4% | <4% | | GMI (Glucose Mgmt Indicator) | 6.8% | 6.1% | 5.6% | 5.1% | <5.7% | | CV (Coefficient of Variation) | 34% | 28% | 22% | 17% | <36% | | Standard Deviation | 50 mg/dL | 36 mg/dL | 25 mg/dL | 16 mg/dL | — | The coefficient of variation going from 34% to 17% is the stat I'm most proud of. It means my glucose is incredibly stable throughout the day. My post-meal spikes that used to hit 220+ now barely break 130. Typical pre-sema day: Fasting 118 → post-breakfast 210 → crash to 78 → post-lunch 195 → post-dinner 224 → overnight 130 Typical current day: Fasting 84 → post-breakfast 118 → post-lunch 112 → post-dinner 124 → overnight 88 The roller coaster is GONE. Flatline glucose is the goal and I'm basically there. 📈→📉→📈 became ➡️

This is incredible data. I'm an engineer so I appreciate the statistics. The CV dropping from 34% to 17% is impressive — anything under 36% is considered "stable" and you're way below that. I started wearing a Dexcom G7 when I began tirzepatide 4 months ago. Here's my Clarity report summary: | Metric | Month 1 | Month 4 | |--------|---------|---------| | Mean Glucose | 132 mg/dL | 104 mg/dL | | TIR (70-180) | 74% | 94% | | Time Above 180 | 18% | 2% | | CV | 31% | 19% | | Avg Post-Meal Peak | 186 mg/dL | 128 mg/dL | | Time to Peak (post-meal) | 45 min | 68 min | The last row is interesting — time to peak glucose after meals went from 45 minutes to 68 minutes. This means the glucose absorption is being delayed (GLP-1 slows gastric emptying) AND the peak is lower AND it returns to baseline faster. Triple win.

Excellent CGM data from both of you. Let me explain why these metrics matter clinically: Time in Range (TIR): The international consensus recommends >70% TIR for most diabetic patients. Above 90% is essentially non-diabetic glucose regulation. Mike, your 96% is exceptional. Coefficient of Variation (CV): This is arguably the MOST important CGM metric. High glucose variability (high CV) independently increases oxidative stress and endothelial damage — even if mean glucose is acceptable. A CV <36% is the target; both of you are well below that. Why stable glucose matters beyond just "average": - Glucose spikes → reactive oxygen species (ROS) → endothelial damage → atherosclerosis - Glucose variability → sympathetic nervous system activation → elevated cortisol → visceral fat deposition (vicious cycle) - High CV correlates with hypoglycemia risk, cognitive impairment, and increased mortality in hospitalized patients The mechanism of GLP-1 effect on CGM traces: 1. Delayed gastric emptying → slower glucose absorption → lower peaks 2. Enhanced first-phase insulin secretion → faster insulin response to meals → shorter time above range 3. Suppressed glucagon → reduced hepatic glucose output → lower fasting and inter-meal glucose 4. Improved beta cell sensitivity → more appropriate insulin dosing by the pancreas The combination produces exactly what you're seeing: lower mean, lower variability, and almost no excursions above 180.

The dawn phenomenon is what changed most for me. Before semaglutide, my CGM would show my glucose climbing from about 3am to 7am every single night — from ~100 to ~145 without eating anything. Classic dawn phenomenon from hepatic glucose output. After 5 months on sema: | Metric | Before | After | |--------|--------|-------| | 3am glucose (avg) | 102 mg/dL | 84 mg/dL | | 7am glucose (avg) | 144 mg/dL | 92 mg/dL | | Dawn phenomenon rise | +42 mg/dL | +8 mg/dL | My overnight trace is basically flat now. The glucagon suppression from semaglutide shut down that hepatic glucose dump almost completely. My endo said this was one of the most therapeutically meaningful changes she sees on CGM for T2D patients.

I've been doing food experiments with my CGM before and after starting tirzepatide. Same meals, same portions: White rice (1 cup, measured): | Metric | Pre-Tirz | On Tirz | |--------|---------|---------| | Peak glucose | 198 mg/dL | 142 mg/dL | | Time to peak | 38 min | 72 min | | Time above 140 | 94 min | 18 min | | Return to baseline | 3.2 hrs | 1.8 hrs | Pizza (2 slices, same brand): | Metric | Pre-Tirz | On Tirz | |--------|---------|---------| | Peak glucose | 212 mg/dL | 156 mg/dL | | Time to peak | 52 min | 88 min | | Time above 140 | 128 min | 32 min | | Return to baseline | 4.1 hrs | 2.4 hrs | Grilled chicken + vegetables: | Metric | Pre-Tirz | On Tirz | |--------|---------|---------| | Peak glucose | 124 mg/dL | 108 mg/dL | | Time to peak | 42 min | 55 min | | Time above 140 | 0 min | 0 min | | Return to baseline | 1.4 hrs | 0.9 hrs | The protein + veggie meal barely changed because it wasn't causing spikes to begin with. The high-carb meals show massive improvement. This has completely changed how I think about food. I'm not "scared" of carbs anymore — my body just handles them so much better now. 🍚