A simple framework for endurance athletes with diabetes who are tired of guessing mid-session
Your glucose is not judging you.
It’s reporting on stress.
Most endurance athletes with diabetes are arguing with the report instead of reading it.
You glance at your CGM mid-workout.
You see a number you don’t like.
You make a decision based on emotion instead of context.
High. Panic.
Dropping. Overcorrect.
Flat. Assume you nailed it.
Glucose becomes a verdict.
It’s not.
It’s a signal.
And like heart rate, pace, or power, it only makes sense inside context.
Glucose Is Not a Moral Score
A rising glucose during intervals is not “bad.”
A slow drift downward during a long Zone 2 ride is not “failure.”
A flat line is not automatically “perfect control.”
High intensity work triggers stress hormones. Your liver releases glucose. Numbers climb.
Long steady aerobic work pulls from circulating fuel. Numbers may fall.
That is physiology.
Not a character flaw.
Three Questions Before You React
Instead of asking, “Is this good or bad?” ask:
- What intensity am I at right now?
- What did I eat in the last 60–90 minutes?
- What is the trend, not just the number?
Trend beats snapshot every time.
A 165 with a flat arrow during threshold work tells a very different story than 165 and climbing fast while you’re jogging easy.
If you treat both situations the same, you’ll make the wrong call at least half the time.
And in my experience, a 50/50 decision means I will be wrong 100 percent of the time. Every time. I don’t understand the math either. I’ve stopped trying.
So I stopped guessing. I started interpreting.
Context beats panic.
Most Athletes Overcorrect
Here’s the common cycle:
Small downward trend.
Athlete takes 30–40 grams of carbs.
Glucose spikes.
Insulin follows.
Crash.
Repeat.
Now training feels chaotic. Energy feels unpredictable. Confidence drops.
The issue usually isn’t the workout.
It’s the reaction cycle.
Small corrections work better than dramatic ones.
Measured fueling works better than fear fueling.
You wouldn’t add 100 watts because your power dipped 5 watts for 30 seconds.
Don’t treat glucose that way either.
Glucose Is a Performance Metric
When interpreted well, glucose tells you:
- Whether your fueling strategy matches your workload
- Whether intensity is appropriate for the day
- Whether recovery is adequate
- Whether outside stress is bleeding into training
It’s not just about avoiding lows.
It’s about learning your patterns.
What happens to your glucose during VO2 intervals?
During a 90-minute Zone 2 ride?
After poor sleep?
On high-caffeine days?
Those patterns are yours.
Once you recognize them, you stop reacting.
You start anticipating.
That’s when diabetes stops feeling like a constant interruption and starts feeling like another variable you manage.
Not control.
Manage.
Big difference.
If you’re an endurance athlete with diabetes and you’ve ever overcorrected a tiny glucose drop like it was DEFCON 1, you’re not alone.
Most athletes are reacting.
Very few are interpreting.
If you want the simple framework I use to help athletes read their glucose during training without panic, comment Signal below.
I’ll send it to you.
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