Biology Common Questions
We’ve compiled answers to the most frequently asked questions about Biology.
How do I log Weight, Lean Body Mass, Body Fat in the Biology tab?
Bevel gets your body data from Apple Health or connected integrations.
Weight can be logged directly in Bevel, or synced from Apple Health or a connected device.
Lean Body Mass and Body Fat can’t be entered directly in Bevel. They are imported from Apple Health or other integrations. Smart scales can capture this data and sync it to Apple Health.
Why is my VO2 Max Data missing?
To verify if you have Cardio Fitness or VO₂ Max data, go to Apple Health → VO₂ Max (Cardio Fitness) and check if any data is recorded. If your device does not sync to Apple Health, check your connected device or integration to confirm it is tracking and syncing this data.
How do I make my watch track VO₂ Max Data?
On Apple Watch, VO₂ Max is estimated during outdoor walks, runs, and hikes. Each workout should be at least ~20 minutes so the watch can gather enough data. Because the estimate uses GPS distance, these workouts need to be done outdoors. Garmin devices can also estimate VO₂ Max during cycling when power (watts) data is available.
Tip: In Bevel, you can manage what data sources VO₂ Max data comes from by going to Profile → Data Sources → VO₂ Max. You can read more about managing data sources here.
Why Your Age Biomarker Scores Don't Sum Perfectly
If you have a mix of physiological, lifestyle, and blood biomarkers available, you may notice that the year-impact estimates across your individual factors don't add up neatly to your total Biological Age delta. This is intentional.
Many factors in the model overlap; they're measuring related aspects of the same underlying biology. Resting Heart Rate and VO₂ Max both reflect cardiovascular fitness. Glucose and Nutrition Score are biologically linked. Lean Body Mass and Strength Training are cause and effect. If the model treated each independently, it would double-count these relationships and overstate the total impact. Instead, Bevel accounts for this, so the combined effect is appropriately moderated. The individual contributions won't sum to a clean total, but the overall estimate is more accurate because of it.
In addition, Biological Age takes into account the Confidence Level for each biomarker, and prioritizes those with the most up to date and complete data. For example, if your blood tests are 18 months old, they will be weighted less in the overall Biological Age equation.