7/21/2026

Type 1 Diabetes: My Blood Sugar Hit 476 After Forgetting Insulin – A Day of Extreme Fluctuations!

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I completely forgot to inject my 12 units of fast-acting Humalog insulin before lunch. I'm now acutely aware of just how directly a meal without insulin impacts my blood sugar levels and the crucial role insulin plays. Although I frantically tried to correct it in the evening, the rest of the day, leading into the night, became a chaotic rollercoaster of extreme fluctuations.

【Summary】

  • Forgetting my 12 units of insulin before lunch led to a rapid post-meal blood sugar spike.
  • My lunch consisted of one bowl of rice, a piece of teriyaki yellowtail, kimchi natto, and one broccoli floret, so the main carbohydrate source was essentially the rice.
  • The peak value on my glucose graph for this incident shot off the charts, reaching a staggering 476 mg/dL.
  • It became clear that eating a meal without insulin can cause my blood sugar to rocket by a massive +325 mg/dL from baseline.
  • Noticing the high blood sugar, I administered an additional dose in the evening, but this led to intense fluctuations, with my levels plummeting rapidly overnight.

[Data from Forgetting Insulin Before Lunch]

  • Before 1 PM, my levels were very stable, around 130 mg/dL, but immediately after starting my meal, the graph surged with an abnormal, near-vertical climb.
  • Just after 4 PM, it reached an dangerously high peak of MAX 476 mg/dL, a level where I could truly feel my body in distress.
  • Around 4:30 PM, startled by how high it was, I realized I needed to act and attempted to correct it by administering an additional 2 units of Humalog.
  • After 6 PM, once the additional dose began to take effect, my levels reversed course and plummeted rapidly.
⚠️ Important Notice
The blood sugar data and graphs published in this article are solely personal measurement records and impressions, and do not endorse or guarantee any specific medical treatment, diet, or diagnosis. Blood sugar fluctuations and bodily reactions vary from person to person. If you are currently undergoing treatment or on a restricted diet, please consult your primary doctor 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.

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