Guide · By DueTrack Studio · Updated 2026-10-29
How to keep a blood sugar log your doctor will actually use
A useful blood sugar log records each reading with the time, whether it was before or after a meal, and short notes on food, activity, sleep or medicine. Follow the testing schedule your healthcare team gives you, and review the log for patterns — the same time of day running high, or a meal that always spikes you.
What should a blood sugar log include?
- Date and time.
- Reading and unit (mg/dL or mmol/L).
- Context: fasting, before a meal, or one to two hours after.
- What you ate, roughly.
- Activity, such as a walk after the meal.
- Medicines and any missed doses.
- Sleep, stress or illness that day.
When should you check?
Follow the schedule your doctor or diabetes educator gives you — it depends on your treatment. The CDC explains why regular monitoring helps you and your team make decisions.
How do you find patterns?
- Compare the same time of day across a week.
- Compare readings after different meals.
- Note what happens after post-meal walks.
- Bring a summary, not just raw numbers, to appointments.
Questions
I just started checking my sugar. What should I write down besides the number?
The time, whether it was fasting or after a meal, and a quick note on what you ate and did. Context turns numbers into patterns.
Does DiaFit read my blood sugar from the phone?
No. You record readings from your own meter; the phone's sensors do not measure glucose.