Back from a visit to my endocrinologist last year, I had a mountain of records in front of me, spread between paper notebooks and mobile apps. Quickly, I realized that no standard platform perfectly matched my needs: I wanted flexibility, customization, and above all a clear view of my blood sugar curve over time. That’s when Excel came into play, as a true partner for my health monitoring. In this article, I share in detail how I built my own dashboard, which Excel tools and tips I use daily, and why you too can save time (and peace of mind) by adopting this method.
Why track your blood sugar in a spreadsheet?
Many mobile apps offer polished interfaces, instant alerts, and even dose adjustment suggestions. However, their rigidity is felt as soon as you want to finely explore your data or cross-reference several parameters (meals, physical activity, stress, etc.). With Excel, you benefit from:
- Flexibility: organize your columns and sheets according to your real needs.
- Power of formulas: SUMIF and SUMIFS to calculate your totals under conditions, COUNTIF and COUNTIFS to precisely count your peaks or hypoglycemias.
- Custom visualization: curves, bar charts, heatmaps, or even box-and-whisker plots to study the dispersion of your measurements.
- Confidentiality: all your data stays on your device, without dependence on a third-party cloud service (unless you want it).
Structuring your monitoring step by step
1. Create a clear plan
Before opening your workbook, list the information to track: date, time, blood sugar (in mmol/L or mg/dL), meals (breakfast, lunch, snack, dinner), insulin doses, physical activity, comments (stress, fatigue, symptoms…). This reflection phase ensures a sustainable model, which you enrich over time.
2. Set up the essential columns
Once you have defined your plan, open Excel and create a sheet named “Blood-Sugar-Tracking”. Header your table:
| Column | Description |
|---|---|
| Date | Date of the record |
| Time | Exact moment (e.g., 07:30, 13:15) |
| Blood Sugar | Measured value |
| Meal | Type (main meal, snack…) |
| Insulin | Number of units injected |
| Activity | Duration or intensity (walking, sport…) |
| Notes | Symptoms, mood, stress |
3. Automate calculations
Rather than manually compiling your averages or counts, Excel has dedicated functions:
| Function | Role |
|---|---|
| SOMME.SI | Adds values meeting a criterion (e.g. sum of blood glucose levels above 10 mmol/L). |
| SOMME.SI.ENS | Sum under multiple conditions (e.g. blood glucose after 6 pm AND carbohydrate-rich meal). |
| NB.SI | Counts the number of cells satisfying a criterion (e.g. hypoglycemia below 4 mmol/L). |
| NB.SI.ENS | Counts with multiple criteria (e.g. number of meals without insulin injection). |
By placing these formulas in a dedicated “Statistics” sheet, you instantly get your daily totals, week by week, or by type of dietary reference.
Visualize trends and variability
Visual analysis is crucial to anticipate sudden rises or drops. Several representations complement each other:
Time series and bar charts
The line or bar chart remains the most immediate option to track your blood glucose throughout the day. By choosing the x-axis for the time and the y-axis for the blood glucose, you highlight postprandial peaks.
Box plots and dispersion
To measure dispersion and easily spot outliers, nothing beats a Box plot chart. This tool informs you about the median, quartiles, and data range. It is particularly useful when you want to compare, for example, variability before and after a treatment change.
Analyze and create alerts
Conditional thresholds and formatting
Excel offers Conditional Formatting to color cells whose value exceeds a certain threshold (hypoglycemia or hyperglycemia). You can thus immediately spot any critical measurement without scanning rows of numbers.
Interactive slicers for filtering
If you want to explore your tracking by meal type or period, slicers applied to a pivot table represent a huge time saver. With one click, you filter by date, meal, or blood glucose range, without modifying your formulas.
Advanced tips for ever finer tracking
Using VLOOKUP and INDEX/MATCH
When your workbook grows, gathering scattered information across multiple sheets becomes a headache. The VLOOKUP function (or its INDEX/MATCH equivalents) facilitates data consolidation: automatically retrieve blood glucose standards based on a code or patient profile.
Text exploration and comments
To analyze your notes on stress, weather, or diet, text functions can extract specific keywords. For example, you can list all lines where the word “fatigue” appears:
“Using SEARCH and MID allowed me to spot the days when I felt more tired… and associate it with more unstable blood glucose!” – testimony from a patient
Conclusion and Best Practices
In just a few clicks, Excel transforms into a comprehensive tracking tool for your blood sugar. With a well-structured template, adapted formulas, and relevant charts, you gain clarity, improve your communication with your medical team, and above all, take back control of your health. Don’t hesitate to customize the colors, add new columns (stress, sleep…), and regularly save your file.
Finally, to automate sharing or saving, consider simple macros or OneDrive/SharePoint. With a bit of practice, you will have a dashboard as elegant as it is effective, capable of evolving with your needs.
FAQ
Can multiple patients be tracked in the same workbook?
Yes, by creating one sheet per profile and a “Overall Results” sheet that consolidates data via VLOOKUP or INDEX/MATCH.
What time scale should be preferred for the charts?
Start with a daily view then weekly. Slicers will then allow you to zoom in on specific periods (month, quarter…).
How to automatically save my data?
Use the auto-save feature of Office 365 or set up a very simple VBA macro that saves your file each time it closes.
Is a particular add-in required for box plots?
No: Excel 2016 and later versions natively include the Boxplot chart. If you have an earlier version, an add-in or Power Query / Power BI can help.
Happy creating your health tracking table, and don’t hesitate to share your tips!