[EN] The Day Snacks Sent My Blood Sugar Soaring: A Type 1 Diabetes Story

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Just when my blood sugar was stable, I indulged in some snacks: three pieces of Happy Town crackers, two pieces of 72% cacao chocolate, and one Yoshimura's Okaki Onikko rice cracker. To my surprise, I recorded a rapid and unexpected blood sugar spike (+329 mg/dL)! I quickly responded by administering 3 units of insulin and going for a 20-minute run. As a result, my levels dropped quickly, leading to an intense wave of fluctuations.

【Summary】

• My stable blood sugar levels suddenly skyrocketed after a small combination of snacks.
• It resulted in a rapid spike, recording a significant rise (Δ +329 mg/dL) at its peak.
• Combining 3 units of insulin with a 20-minute run led to a swift drop in blood sugar.

Snack Choices and Sudden Blood Sugar Spikes

• The snacks consisted of three pieces of Happy Town crackers, two pieces of 72% cacao chocolate, and one Yoshimura's Okaki Onikko rice cracker. The inclusion of rice crackers (like senbei and okaki) and sweet treats likely led to rapid absorption and a sharp increase in blood sugar.
• This was a clear reminder that even small amounts, when concentrated in carbohydrates, can send blood sugar levels soaring instantly.

Rapid Drop from Insulin and Running

• After noticing the sharp rise, I administered an additional 3 units of insulin and went for a 20-minute run.
• As shown in the graph, the combined effect of glucose uptake by muscles from exercise and the insulin led to a rapid decline in blood sugar.
• While the swift response led to a quick drop from the peak, I realized that such intense fluctuations also carry a risk of hypoglycemia, which needs careful monitoring.

⚠️ Important Note on Usage

The blood sugar data and graphs presented in this article are solely personal measurement records and observations, and do not recommend or guarantee specific medical treatments, dietary therapies, or diagnoses. Blood sugar fluctuations and bodily reactions vary individually. If you are currently undergoing treatment or on a restricted diet, please consult your primary physician or a registered dietitian in accordance with your own health condition. This blog assumes no responsibility for any damages arising from the use of this information.

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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*Medical Disclaimer: The content on this blog represents the author's personal records for informational purposes only. Always consult with your doctor.

Weekly Glucose Report (2026/10/03)

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Weekly Blood Sugar Management Summary

Looking back at this week's blood sugar management, the average blood glucose level was 195 mg/dL, and the Time in Range (TIR), representing the percentage of time spent within the target range (70–180 mg/dL), was 40.3%. Although there were several periods of elevated blood sugar, it was great to get through the week safely while avoiding severe hypoglycemia.

A key point of concern was the noticeable spikes in blood sugar during the afternoon and at night. Factors such as meal choices, eating timing, and post-meal activity levels likely played a role. However, there were also very stable days, like Thursday, so I plan to use the routine from those good days as a reference to make adjustments.

Understanding the patterns in my blood sugar fluctuations is the first step toward positive improvement. Next week, I want to keep taking things step by step and enjoy building healthy lifestyle habits!

Weekly Trend Analysis

Looking at the weekly report, the average blood glucose level was 195 mg/dL, and the CV (coefficient of variation, an indicator of blood sugar variability) was 32.1%, showing a trend toward slight fluctuations in blood glucose levels. The TIR was 40.3%, with a certain proportion of time spent in hyperglycemia (above 180 mg/dL). On the other hand, there were almost no instances of hypoglycemia (below 70 mg/dL), showing that it was managed safely in that regard.

Please note that data for GMI (Glucose Management Indicator) and weekly comparisons could not be confirmed from the image. It was a week that showed great potential for further increasing the TIR percentage by gradually reducing the time spent with high blood sugar.

Daily Summary Analysis

Comparing the daily graphs revealed specific trends depending on the day of the week. The best day was Thursday, October 1, with an average blood glucose level of 132 mg/dL, maintaining very stable levels throughout the day. On the other hand, Monday, September 28 had an average of 220 mg/dL, Friday, October 2 reached a peak of 376 mg/dL, and Saturday, October 3 averaged 204 mg/dL, showing a stronger tendency toward high blood sugar later in the week and over the weekend.

This was likely influenced by larger meal portions or increased snacking toward the weekend. To increase the number of stable days like Thursday, it seems worth adjusting how I spend my weekends and days off.

AGP Analysis

Checking the AGP graph, which shows 24-hour blood sugar patterns, levels tend to remain elevated above 200 mg/dL from late night to early morning (around 00:00 to 03:00), and drop to around 150–180 mg/dL around midday (11:00 to 13:00).

However, postprandial spikes are noticeable during the afternoon (around 14:00 to 16:00) and at night after 21:00, with a wider percentile range (data variability). While the overall risk of hypoglycemia appears low, paying attention to high blood sugar risks after afternoon snacks and dinner can help reduce overall blood sugar fluctuations.

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Highlights of the Week

• Managed the week safely without experiencing dangerous hypoglycemia (below 70 mg/dL)
• Achieved a very stable day on Thursday (10/01) with an average blood glucose level of 132 mg/dL
• Gained an objective understanding of the time frames when my blood sugar tends to rise (afternoons and after dinner)

Areas for Improvement Next Week

• Review the content and portion size of afternoon snacks (around 14:00 to 16:00)
• Incorporate light physical activity, such as a short walk or housework, after dinner to ease post-meal blood sugar spikes
• Adjust carbohydrate intake at dinner to help keep blood sugar levels steady from night through early morning

Summary

Reviewing my blood sugar data like this has made both my successes and upcoming challenges very clear. Rather than aiming for perfection, I feel it's important to gradually adopt habits from the "good days." I will continue to enjoy building a healthy and comfortable lifestyle at my own pace!

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