Using a CGM to Personalize Your Diet
Wear a continuous glucose monitor for a few weeks to learn which foods and habits spike your blood sugar, then use that personal data to eat for steadier energy. Useful self-experiment, with honest caveats.
Use a CGM for a few weeks to learn 2 to 4 weeks is usually enough to spot your patterns; you do not need to wear one forever
It turns abstract advice into your own personal data.
Note which foods spike you personally Watch for surprises; a food that is fine for others may spike you (and vice versa)
Individual variation is the whole point; generic charts do not capture it.
Eat veg, protein and fat before carbs Front-load vegetables, protein and fat; eat the starchy/sweet part last
Food order and pairing meaningfully blunt the glucose spike from the same meal.
Move after meals A 10 to 20 minute walk after meals (or a couple of minutes every half hour)
Light post-meal movement lowers the glucose response.
Account for non-food spikes Notice how poor sleep and stress raise glucose; note that exercise and sauna can raise it for healthy reasons
Glucose reflects more than food; context prevents misreading the data.
Apply what you learned and move on Once you know your patterns, keep the habits; you do not need to monitor indefinitely
The goal is durable habits, not permanent surveillance of every meal.
This protocol works from your actual levels. Testing partner coming soon.
- Continuous glucose monitor
We may earn a referral fee if you book testing through a future partner link; it will never affect which tests are listed here. This is not medical advice or a diagnosis.
Post-meal glucose responses vary a lot between people due to genetics, the microbiome, sleep, stress and activity, so generic glycemic-index charts often mislead.
View sources
Continuous glucose monitoring with Casey Means: what spikes you and why (Levels)
Using glucose as a continuous health marker, with Dr. Casey Means (Levels)
How CGM gives personal, real-time dietary feedback (Wellness Mama interview with Dr. Casey Means)
Not medical advice. This page is for education only and is not a substitute for professional medical care. Consult a qualified clinician before changing your health routine.
Independent curation. YourProtocol is an independent platform. This protocol is based on the publicly available work of Casey Means and is not created, reviewed, endorsed by, or affiliated with Casey Means or Levels / Stanford-trained physician.
Is this for you
- Not a fit if tracking meals could fuel food anxiety (see cautions)
- Curious self-experimenters
- People with energy crashes after meals
- Anyone wanting to personalise their diet
- Those with a family history of metabolic issues
Cautions
- Disclosure: Casey Means co-founded Levels, a company that sells CGM software, so there is a commercial interest in recommending CGMs
- In healthy, non-diabetic people the benefit of chasing flat glucose is debated; brief spikes after meals are normal, not inherently harmful
- A CGM is not a diabetes diagnosis tool; if you are concerned about blood sugar, see a doctor for proper testing
- For some people, tracking every meal can fuel food anxiety or orthorexia; if monitoring makes eating stressful, stop and seek support
- Educational only, not medical advice