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Key Points

Key Takeaways

  • 1

    The Metabolic Dashboard

  • 2

    CGM (Continuous Glucose Monitor): Coin-sized sensor to stick on arm. Just hold smartphone over it (or automatically) to know current blood glucose. Must-have equipment for biohackers, not just diabetics.

  • 3

    Glucose Spike: Blood glucose spikes right after eating carbohydrates (Ramen, Donburi), releases insulin and plummets. This 'Fluctuation' is the true identity of afternoon drowsiness and brain fog.

  • 4

    Data-Driven Diet: Don't believe superstitions like 'Soba is fine'. A/B test with your own body. Just eating salad first might halve the spike even with the same Soba.

  • 5

    Action: Caffeine is vitality borrowed from future, but blood glucose management is optimization of performance.

Introduction: Debt Called Energy Drink

Engineers love Monster and Red Bull. But that is just deceiving fatigue. The root cause is that the “Way of putting in fuel (meal)” is wrong.

If you keep blood glucose constant, the “Zone” (concentration state) lasts infinitely.

1. The Sensor: FreeStyle Libre 3

In the past, you couldn’t measure without pricking a needle and drawing blood. Now, just put a sticker on your arm. You can enter bath with it on for 2 weeks.

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Abbott FreeStyle Libre 2

*Libre 2 is mainstream in Japan. No reader required, can read data directly with smartphone app. Just by looking at the fluctuation graph every minute, predicting 'What happens if I eat chocolate now' becomes possible.

Amazon

2. The Experiment: Ramen vs Steak

Human experimentation becomes fun when wearing CGM.

  • Experiment A: Eat Jiro-style Ramen.

  • Result: Blood glucose explodes to 180mg/dL after 30 minutes, then plummets to 70mg/dL 1 hour later. Intense drowsiness attacks.

  • Experiment B: 300g Steak and Broccoli.

  • Result: Blood glucose is almost flat. Zero drowsiness. Can write code until night.

I’m not trying to say “Carbohydrates are evil”. Knowing “At what timing and what to eat together to avoid spikes” is important.

3. Comparison: Difference with Caffeine

項目 Caffeine (Coffee/Energy Drink) Stable Glucose (CGM)
Mechanism Block Adenosine Receptors (Paralysis) Stabilization of Energy Supply
Duration 3-4 Hours (Crash afterwards) All day
Side Effects Anxiety, Tremors, Poor Sleep Quality None (Healthy)
Cost $2 per can $150/month (Sensor cost)

Conclusion: Monitoring Internal API

We are sensitive to server CPU usage and memory leaks. Why are we indifferent to our own body metrics?

CGM is Datadog for your metabolic system. Apply appropriate patches (diet/exercise) before alerts (abnormal values) occur.

# health # biohacking # cgm # productivity # nutrition # 2026