Continuous glucose monitor: two weeks that change how you view “healthy carbs”
No article is as convincing as your own graph: oatmeal “for your health” — 9.2 after 40 minutes and 4.1 after two hours with hunger; an omelet — a steady line at 5.8. A coin-sized sensor on your shoulder records your glucose every five minutes for two weeks, and afterward “healthy carbs” stop being a matter of debate. Section — blood sugar.
What it shows
Not “fasting blood sugar,” but your response to everything: a specific breakfast, coffee with milk, a “small” apple, a glass of wine, lack of sleep, stress, a walk, a workout, a late dinner. You see that a banana takes you to 8.5, while a handful of berries takes you to 6.0; that your glucose rises after an argument even without food; that 15 minutes of walking after lunch cuts the peak by a third; that five-hour nights make your morning level one unit higher. These are personal data that no table can provide.
How to read it
| What | Normal | Concerning |
|---|---|---|
| Fasting in the morning | 4,0-5,5 | regularly above 5.6 |
| Peak after eating | up to 7.8 | regularly above 8.5 |
| After 2 hours | returned to baseline | above 7.8 or more than 1 below baseline (drop) |
| Daily amplitude | 1.5-2.5 mmol/L | above 3-4 — swings |
| At night | steady at 4.5-5.5 | rises (late dinner) or drops (alcohol) |
| Dawn phenomenon | rise of 0.5-1 by morning | normal, especially during the first weeks with the method |
14 days
one sensor
every 5 min
measurement
-20-30%
peak after a walk
+1
morning after a short night
Experiments over two weeks
Days 1-3: eat as usual, change nothing — establish a baseline. Days 4-7: use the method — protein, fats, vegetables; compare the curves. Day 8: one “test” — oatmeal or bread for breakfast; see the peak and drop. Day 9: the same, but walk for 15 minutes afterward. Day 10: dinner at 21 versus dinner at 18 — observe the night. Days 11-14: follow the method and watch a steady line become the norm. Swings in theory — blood sugar swings; the long-term result — HbA1c.
Pitfalls
- Reacting to every number — the sensor can be off by ±10-15%
- Wearing it for months — two weeks provide a picture; beyond that, it can become an obsession
- Removing berries because of a peak of 6.5 — this is normal
- Panicking over a rise caused by stress or exercise — that is adrenaline, and it is normal
- Comparing yourself with other people’s graphs
Frequently asked questions
Does everyone need this?
No. If you do not believe that oatmeal causes swings and want to see your body in numbers — yes, for two weeks. For everyone else, an HbA1c test once every six months is enough.
Where can I get one?
Sensors for people with diabetes are sold without a prescription in most countries; the app is provided by the manufacturer. Cost — two weeks.
The sensor showed 8.5 after buckwheat — do I have diabetes?
No. Buckwheat is a carbohydrate, and a peak of 7.8-8.5 can occur in a healthy person. Diagnosis is based on HbA1c and fasting glucose, not on a sensor.
Reviewed by Anastasia Zhukova, Fitness Trainer • Author of a Nutrition and Training System • Creator of an AI Personal Support Platform
A human has reviewed this material against the method and real client practice.