8/23/2026

[EN] The Type 1 Diabetes & Blood Sugar Management Blog

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Woke Up with High Blood Sugar After BBQ?!
Why High-Fat, High-Protein Meals Cause "Delayed Spikes" (and How to Avoid Them)

Unlocking the Pathophysiology and Practical Solutions Using CGM (Continuous Glucose Monitor) Data

"My blood sugar won't drop hours after eating BBQ..." "Why is my glucose still sky-high the next morning?" Sound familiar?
In this post, we’ll use real meal logs and CGM (Continuous Glucose Monitoring) data to dive deep into the mechanism behind "delayed hyperglycemia" (or delayed spikes) triggered by high-fat, high-protein meals like BBQ, and share actionable ways to handle them.

1. The Meal & Its PFC (Protein, Fat, Carb) Balance

This meal featured various cuts of meat, grilled veggies, a regular bowl of white rice, kimchi, and a non-alcoholic beer. At first glance, it doesn't look like crazy overeating, but a breakdown of the nutrients reveals a classic "high-fat, high-protein, medium-carb" combo.

Food / Cut	Est. Weight/Qty	Calories	Protein	Fat	Carbs
Genghis Khan (Mutton)	2 slices (approx. 35g)	77 kcal	6.3g	5.6g	0.1g
Beef Short Rib (Kalbi)	1 slice (approx. 20g)	102 kcal	2.2g	10.0g	0.1g
Beef Loin	1 slice (approx. 20g)	50 kcal	3.8g	3.8g	0.1g
Beef Skirt Steak (Harami)	5 slices (approx. 100g)	211 kcal	14.8g	16.1g	0.3g
Beef Tongue	3 slices (approx. 60g)	161 kcal	9.1g	13.0g	0.1g
Cabbage & Bean Sprouts	approx. 100g	22 kcal	1.5g	0.1g	2.8g
Kimchi	approx. 40g	18 kcal	1.3g	0.1g	2.1g
White Rice (Regular Bowl)	1 bowl (approx. 150g)	234 kcal	3.8g	0.5g	53.4g
BBQ Dipping Sauce	approx. 35g	45 kcal	0.7g	0.2g	9.8g
Non-Alcoholic Beer (Zero ICHI)	Medium Mug (approx. 400ml)	36 kcal	0.4g	0.0g	8.0g
Total	-	856 kcal	43.9g	49.4g	72.8g

【PFC Breakdown Key Takeaway】
Out of a total of ~856 kcal, fat accounts for about 52%, protein for 20%, and carbs for 28%. The most striking feature here is that over half of the energy comes from fat.

2. Why Won't My Blood Sugar Go Down? 3 Reasons Behind Delayed Hyperglycemia

When you eat simple carbs like rice or noodles alone, your blood sugar usually peaks within 30 to 60 minutes. But throw a massive amount of fat and protein into the mix, and your body triggers these three responses:

① Delayed Gastric Emptying (Digestion Slows to a Crawl)

Once fat hits your small intestine, gut hormones (like CCK) are released, putting the brakes on your stomach's motility. This dramatically delays the rate at which the carbs from the rice and sweet dipping sauce enter the small intestine, leading to a slow, steady trickle of glucose absorption over hours.

② Acute Insulin Resistance (Insulin Becomes Less Effective)

Dietary fats elevate free fatty acids (FFAs) in your bloodstream. When these fatty acids are taken up by muscle cells, they interfere with insulin signaling—temporarily blunting your insulin sensitivity and making it incredibly tough to bring your blood sugar down.

③ Protein-Induced Gluconeogenesis & Glucagon Release

The massive load of protein (amino acids) from the meat triggers the pancreas to release glucagon. Glucagon stimulates gluconeogenesis—the process where your liver creates brand-new glucose—causing your body to pump out sugar all through the night and into the next morning.

3. What the CGM (Continuous Glucose Monitor) Data Reveals

Looking at the actual readings, the classic pattern of a post-BBQ blood sugar curve is plain as day.

Average Glucose (AVG)

169 mg/dL

Peak Glucose (MAX)

271 mg/dL

Time in Range (TIR)

48 %

Coefficient of Variation (CV)

41.3 %

【Blood Sugar Timeline】
・8:30 PM (Meal Starts): Baseline is stable and in the normal range at 70–100 mg/dL.
・11:30 PM (~3 Hours Post-Meal): Rising much slower than a typical meal, hitting a peak of 271 mg/dL.
・12:00 AM – 6:00 AM (Overnight): When levels should normally be dropping, they remain locked in an extremely high plateau of 240–265 mg/dL.
・8:00 AM (Next Morning): Over 10 hours later, hyperglycemia persists around 220 mg/dL.

4. 5 Practical Ways to Beat Delayed Spikes from BBQ

How to enjoy a delicious BBQ feast without dealing with crazy spikes and next-day high blood sugar.

Front-Load Your Fiber: Start your meal with plenty of cabbage, bean sprouts, and kimchi to help slow down glucose absorption in the small intestine.
Rethink Your Sauces: Skip the sugary BBQ marinades. Instead, opt for low-carb seasonings like salt, black pepper, lemon juice, or wasabi.
Watch the Fat + Carb Combo: If you're eating fatty cuts like short rib or skirt steak, keep your rice portion small. Swapping in leaner options like beef loin or mutton is also highly effective.
Get Moving After Your Meal (15–20 Min Walk): Light physical activity within 30 to 60 minutes after eating activates non-insulin-dependent glucose uptake (GLUT4) in your muscles.
For Those on Insulin: Talk to your doctor beforehand about timing your boluses or using advanced dosing methods like extended or dual-wave boluses.

*The content of this article is for general informational purposes only. Please consult a healthcare professional for medical diagnosis, treatment, or adjustments to your medication or insulin dosages.

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.

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[EN] T1D & Beyond: Real Insights for Mastering Blood Sugar Control

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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).

21:30 - 22:00 1–2 Hours Post-Meal: 120–150 mg/dL
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.

01:30 5.5 Hours Post-Meal: Peak Spike (289 mg/dL)
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.

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.

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8/16/2026

Weekly Glucose Report (2026/08/15)

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This Week's Blood Glucose Management Summary

Looking back at this week's blood glucose management, blood glucose levels spent a lot of time overall staying higher than the target range, making it a week with a few remaining challenges. However, I view the fact that daily fluctuation patterns and the times when my blood glucose tends to move are clearly visualized as a big positive step toward future improvement.

A particularly positive aspect was that the risk of hypoglycemia (less than 70 mg/dL) was extremely low throughout the week, allowing me to spend the week safely. On the other hand, the postprandial rises due to the influence of meals and the prolonged high blood glucose state during the night were areas of concern. Next week, I hope to aim for more comfortable management by making minor adjustments to the content and timing of my meals.

Weekly Trend Analysis

Looking at the weekly trend report, this week's average blood glucose level was 215 mg/dL, and the TIR (Time in Range), which indicates the time spent within the target range (70–180 mg/dL), was 20.6%. There was a general tendency for levels to be higher than the target during many time periods. On the other hand, the CV (coefficient of variation), which indicates the variability of blood glucose levels, settled at a relatively low value of 22.5%, suggesting that sharp, rapid fluctuations themselves were kept in check.

Note that detailed comparison data with the GMI and the previous week could not be confirmed from the image this time. The minimum blood glucose level was 102 mg/dL, and being able to spend the week without worrying about hypoglycemia can be considered a positive change for this week. Shifting high blood glucose time periods gradually into the target range is a goal for the future.

Daily Summary Analysis

Looking at the daily trends, different characteristics emerged depending on the day of the week. The day with the lowest average blood glucose level and relatively good control was Sunday (Aug 09) at 200 mg/dL. On this day, a minimum value of 102 mg/dL was recorded at 15:30, suggesting that temporary daytime control was handled well.

On the other hand, the day with the highest average value was Wednesday (Aug 12) at 246 mg/dL (*though the data only goes up to just past noon). Monday and Tuesday also had averages in the low 200 mg/dL range, suggesting that factors such as daytime food choices, stress at work, or low activity levels might have kept blood glucose levels high. I want to organize my daily behavioral patterns while remaining mindful of the relationship between lifestyle habits and blood glucose levels.

AGP Analysis

Using the AGP (Ambulatory Glucose Profile) graph, I analyzed the characteristics of 24-hour blood glucose fluctuations. First, the time of day when blood glucose levels fell the lowest was around 16:00, with the median dropping to around 140 mg/dL, staying well within the target range indicated by the green line (180 mg/dL or below). This suggests that activity levels were high during this time, leading to easier consumption of glucose.

On the other hand, postprandial upward trends are prominent around 12:00–14:00 after lunch, and after 21:00, which is likely post-dinner. In particular, during the night (from 21:00 to around 6:00 the next morning), the median remained at a high level of around 250 mg/dL, suggesting room for improvement in nighttime glucose stability. Looking at the shaded width (range of fluctuation) on the graph, the width is wider in the afternoon, which likely indicates that differences in daily meals and activity levels are causing variability during this time frame. Overall, while the risk of hypoglycemia is extremely low, addressing the risk of hyperglycemia seems crucial.

Key Positive Points This Week

No occurrences of hypoglycemia (less than 70 mg/dL), allowing for a safe week
The coefficient of variation (CV) was relatively low at 22.5%, indicating that rapid fluctuations in blood glucose levels were kept in check
Blood glucose was controlled within the target range (180 mg/dL or below) during certain periods, such as Sunday daytime

Areas for Improvement for Next Week

Adjusting dinner menus and meal times to ease high blood glucose states from nighttime into the early morning
Incorporating light post-meal walks to suppress the spike around 12:00–14:00 after lunch
Staying mindful of keeping daily snacks and activity levels consistent to reduce the variability of afternoon blood glucose levels

Summary

By looking back at this week's data, I gained very valuable insights into when my body raises and lowers blood glucose levels. Even if the numbers are on the higher side, they are important clues for taking the next step. Let's keep moving forward one step at a time, without rushing, and enjoy creating a comfortable, healthy state for our bodies!