The Exercise Plot Twist (and what your CGM is trying to tell you) 🤫

How different workouts affect your blood sugar—and how to work with your Body, not against it...

Author

Daniel Stickler
December 23, 2024

"By three methods we may learn wisdom: by reflection, by imitation, and by experience. The greatest of these is reflection." - Confucius

Hey Health Explorers!

Last week, we got cozy with our CGMs and learned to decode their basic language. But today? We're about to blow your mind with something that might seem counterintuitive: exercise doesn't always do what you'd expect to your glucose levels. In fact, that HIIT class you're crushing might be sending your blood sugar on a roller coaster ride!

The Exercise-Glucose Mystery 🤔

Picture this: You strap on your CGM, head to the gym feeling virtuous, crush a workout, and then... wait, why is your glucose spiking? Shouldn't exercise always lower blood sugar?

Plot twist: Different types of exercise affect your glucose in wildly different ways.

The Cast of Characters 🎭

Let's break down how different workouts show up on your CGM:

1. The Steady State Cardio Story 🚶‍♂️

What it looks like: A gentle downward slope

  • Think: Long walks, easy jogs, casual cycling

  • Your CGM usually shows: Gradual glucose decrease

  • Why: Your muscles are calmly sipping on glucose like a smooth jazz soundtrack

2. The HIIT Drama Queen 🏃‍♂️

What it looks like: Sharp spikes followed by drops

  • Think: CrossFit, sprint intervals, intense boot camps

  • Your CGM usually shows: Unexpected glucose spikes

  • Why: Your stress hormones are throwing a party, causing your liver to dump glucose into your bloodstream

3. The Weight Training Plot Twist 🏋️‍♀️

What it looks like: Moderate rises with quick returns

  • Think: Traditional strength training, bodyweight exercises

  • Your CGM usually shows: Small spikes during, better stability after

  • Why: You're building glucose-hungry muscle while temporarily raising stress hormones

Here's where things get interesting. Your CGM might show:

  1. Higher glucose during intense exercise (totally normal!)

  2. Better numbers after strength training (hello, muscle growth!)

  3. Lower morning readings after evening cardio (improved insulin sensitivity)

Timing Is Everything ⏰

Want to work with your body instead of against it? Here's the insider's guide:


Morning Workouts 🌅

  • Fasted cardio: Can improve fat burning but watch for low glucose

  • HIIT: Might need a small pre-workout snack

  • Strength training: Often works well with or without breakfast

Afternoon 🌤️

  • Your insulin sensitivity is usually highest

  • Perfect for mixed workouts

  • Better glucose stability overall

Evening 🌙

  • Gentle movement: Can improve next-day numbers

  • Intense workouts: Might disrupt sleep through stress hormone release

  • Sweet spot: Moderate exercise 2-3 hours before bed

The Strategy Guide 🎮

For Fat Loss Goals:

  1. Start with morning cardio (but fuel if needed!)

  2. Add strength training 2-3 times weekly

  3. Watch your CGM for personal patterns

For Muscle Gain:

  1. Focus on strength training

  2. Time carbs around workouts

  3. Use CGM data to optimize recovery

For Overall Health:

  1. Mix movement types

  2. Pay attention to recovery signals

  3. Find your personal sweet spots

Pro Tips from the CGM Chronicles 🎯

  1. The Pre-Workout Puzzle

    • High intensity? Small protein/fat snack might help

    • Steady state? Fasted could be fine

    • Watch your CGM to find YOUR pattern

  2. The Post-Workout Plot

  1. Notice faster glucose drops after conditioning your body

  2. Watch for improved morning numbers

  3. Track recovery quality through glucose stability

    1. The Recovery Chapter

  1. Better glucose control = better recovery

  2. Stress management shows in your numbers

  3. Sleep quality reflects in morning readings

Your Week 4 Mission 📋

  1. Track Your Workouts:

    • Note exercise type, time, and intensity

    • Watch your CGM during and 2 hours after

    • Look for patterns in recovery

  2. Experiment With:

  • Different workout times

  • Various intensity levels

  • Pre/post workout nutrition timing

  1. Monitor Your Recovery:

  • Morning glucose trends

  • Post-workout stability

  • Sleep quality correlation

Found a workout timing that works like magic? Noticed a weird CGM pattern? Hit reply and let me know! Your experience might help another health explorer in our community.

Keep moving,
Dr. Dan

P.S. Remember that one time I saw my glucose spike to 160 during a super intense CrossFit workout? Turns out that was totally normal – but it sure freaked me out before I understood the exercise-glucose connection! 😅