Body Insights calculates today's CGM average glucose from samples stored in Apple Health. The time window starts at local midnight and ends now.
Daily Overview shows the average, daily range, Today's Readings chart, and Science-Based Analysis. The Blood Glucose card shows your current reading, Time in Range, and stability.
This is a current-day summary. It is not an A1C estimate or a long-term CGM report.
What does Body Insights show?
Current Glucose is the latest reading available today.
Average is the mean of today's available readings.
Range runs from today's lowest reading to the highest.
Time in Range is the share of readings between the guide lines shown in the app.
Stability describes how much today's readings vary.
Today's Readings plots each available sample across the day.
Science-Based Analysis sums up the average and the spread of today's readings.
The app shows glucose in mg/dL or mmol/L, based on your selected unit.
How should you use today's glucose overview?
Read Average beside Current Glucose, Range, and Time in Range. The chart shows when the readings changed. Stability shows how much they varied.
Open the Blood Glucose card and tap Daily Overview. If the range is wide, use Today's Readings to see when the larger changes happened.
Example: two patterns with the same average
Suppose Apple Health contains three readings: 90, 105, and 120 mg/dL. The average is 105 mg/dL, and the range is 90 to 120 mg/dL.
Now take three readings of 103, 105, and 107 mg/dL. The average is still 105 mg/dL, but the range is only 103 to 107 mg/dL. Check Range, Time in Range, Stability, and the chart to see the difference.
What happens when readings are missing?
The calculation uses the samples that Apple Health has stored. If your CGM stops syncing for part of the day, those missing hours are not included. Body Insights does not estimate the missing values or show a separate coverage score.
Check Today's Readings before you compare one day with another. A day with a long gap may have a normal-looking average that represents only part of the day.
How is CGM average glucose calculated?
A compatible CGM app can save glucose samples to Apple Health. Body Insights reads the samples available from local midnight to the current time. It adds their values and divides the total by the number of samples. The latest sample becomes Current Glucose. The lowest and highest samples form the Range.
This is the standard meaning of a CGM average glucose: the mean of the readings in the chosen period. Body Insights does not add a hidden score or compare the average with recent days.
How is this different from eAG or GMI?
Estimated average glucose, or eAG, converts a laboratory A1C result into glucose units. Glucose Management Indicator, or GMI, estimates an A1C value from a longer period of CGM data.
Body Insights does neither on this screen. Its Average value is the arithmetic mean of the samples available today.
See today's glucose in one view
Body Insights reads compatible CGM samples from Apple Health and shows your daily average, range, Time in Range, stability, and chart.
View Body Insights on the App Store