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CGM (Continuous Glucose Monitor) Analysis
The "Unaju" Effect: The Science Behind a Blood Sugar Spike 5 Hours Post-Meal
Unaju (Japanese grilled eel over rice) is a classic high-carb, high-fat indulgence. Based on Continuous Glucose Monitoring (CGM) data, we break down the science behind a massive late-night blood sugar spike (peaking at 289 mg/dL) that hit hours after eating—and share strategies on how to handle it.
1. Key Blood Sugar Data Highlights
Peak Glucose (MAX)
289 mg/dL
Reached at 01:30 (5.5 hrs post-meal)
Time in Range (TIR)
53 %
Target: Over 70% (Severely missed)
Coefficient of Variation (CV)
41.7 %
Target: 36% or less (High variability)
20:00 Pre-Meal Glucose: ~92 mg/dL
Injected rapid-acting bolus insulin and started dinner (Unaju, side dishes, and non-alcoholic beer).
Injected rapid-acting bolus insulin and started dinner (Unaju, side dishes, and non-alcoholic beer).
21:30 - 22:00 1–2 Hours Post-Meal: 120–150 mg/dL
Glucose levels remained temporarily stable as insulin hit its peak action.
Glucose levels remained temporarily stable as insulin hit its peak action.
22:30 2.5 Hours Post-Meal: The Rise Begins
Active insulin begins to fade just as delayed glucose absorption kicks in.
Active insulin begins to fade just as delayed glucose absorption kicks in.
01:30 5.5 Hours Post-Meal: Peak Spike (289 mg/dL)
Glucose peaks in the middle of the night, leading to severe hyperglycemia.
Glucose peaks in the middle of the night, leading to severe hyperglycemia.
08:00 Fasting Glucose Next Morning: ~190 mg/dL
The elevated blood sugar lingered through the night without returning to range.
The elevated blood sugar lingered through the night without returning to range.
2. The Science Behind Delayed Hyperglycemia
① Delayed Gastric Emptying Caused by Fats
The rich fat content in eel (approx. 20–30g) triggers gut hormones (like CCK and GLP-1) that slow down stomach emptying. This kept the massive amount of carbs from the white rice sitting in the stomach, significantly delaying its transit to the small intestine.
② The Lag Between Insulin Action and Glucose Absorption
Just as the pre-meal ultra-rapid-acting insulin wore off (typically after 3–4 hours), the delayed wave of glucose finally hit the small intestine, triggering a massive, uncontrolled spike.
③ Prolonged Effects from Free Fatty Acids and Protein
A temporary rise in insulin resistance due to fat metabolism, combined with delayed gluconeogenesis (glucose production in the liver) triggered by the high-protein eel, kept blood sugar elevated from midnight straight into the morning.
3. Meal Breakdown & Metabolic Impact
| Meal Item | Estimated Carbs | Primary Metabolic Impact |
|---|---|---|
| White Rice (Regular Bowl, 260g) | Approx. 95–100 g | The main driver of the spike. Exceeds the standard single-meal allowance for stable control. |
| Kabayaki Eel (2 pieces) | Approx. 3–5 g | Rich in fats and protein, delaying gastric emptying and triggering late-stage gluconeogenesis. |
| Asahi Dry Zero (Non-Alcoholic Beer, Bottle) | 0.0 g | Carbohydrates are strictly dietary fiber; has no direct impact on blood sugar. |
| Nozawana Pickles, Mushrooms, & Clear Soup | Approx. 1–2 g | Dietary fiber helped cushion the initial rise but was not enough to stop the delayed spike. |
💡 Actionable Strategies for Better Glucose Control
- Optimize Carb Portions: Reduce rice to a "small" or "half" portion (120–150g) to limit the total amount of glucose entering the bloodstream later.
- Try a Split Bolus: For high-fat meals, split your insulin dose (some pre-meal and the rest around 2 hours later) to match the delayed digestion curve.
- Leverage Real-Time CGM Alerts: Watch for upward trends around 3 hours post-meal and give a timely correction dose to prevent severe overnight spikes.
*This article is for informational purposes based on personal CGM data analysis and does not constitute medical advice. Please consult your physician or specialist for any changes to your treatment plan.
ℹ️ Note for International Readers:
• Portion Sizes: The food portions and nutritional data featured in this blog are based on standard Japanese serving sizes, which may be smaller than typical Western servings.
• Net Carb Calculation: Net Carbs = Total Carbs - Dietary Fiber.
• Portion Sizes: The food portions and nutritional data featured in this blog are based on standard Japanese serving sizes, which may be smaller than typical Western servings.
• Net Carb Calculation: Net Carbs = Total Carbs - Dietary Fiber.
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*Medical Disclaimer: The content on this blog represents the author's personal records for informational purposes only. Always consult with your doctor.
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