Low + steady
Your fat-use signal stayed low and changed very little. If this pattern persists alongside slowing progress, your metabolism may be stuck in a lower-response state.
A daily view of your fuel pattern
Is your metabolism responding—or stuck in one gear?
FOX2 looks at two things: how strong your fat-use signal is across the day, and whether that signal moves. Together, they can help you see when your metabolism appears responsive, when progress may have stalled, and when a persistent pattern deserves a closer look.
DAILY FUEL SCORE
TODAY — COMPLETE
128
High fat use
MinimalBalancedHighStrong
Today’s patternHIGH + RESPONSIVE
Your daily pattern
Your daily level is only half the picture.
FOX2 shows whether your daily fat-use signal was low, medium, or high. It also looks for meaningful movement between readings, distinguishing a steady day from a responsive one.
Low + responsive
Your overall level is still low, but the movement suggests your metabolism is beginning to respond—a possible early sign that things are moving in a better direction.
Medium + steady
Your fat-use signal reached the middle range but stayed relatively fixed. You are using more fat, although your day shows limited movement between fuel states.
Medium + responsive
Your signal reached the middle range and moved meaningfully. This suggests improving fuel response and an increasing ability to shift between fuel states.
High + steady
Your fat-use signal stayed elevated with little movement. If appetite is very low and this persists, it may be worth considering whether you are eating enough—including enough protein.
High + responsive
You maintained a strong fat-use pattern while still moving between fuel states—the clearest sign of a strong, responsive daily pattern.
How it works
A breath signal becomes a useful daily picture.
As your body draws more energy from fat, your liver produces acetone that leaves in your breath. FOX2 reads that signal, accumulates the day, and shows both your overall level and the movement between readings.
Fuel Signal
Each breath provides a snapshot of your current fat-use signal. A single reading is one moment, not the verdict on your metabolism.
One readingDaily Fuel Score
Your primary result accumulates the fuel signal across the day, making the whole day more useful than any isolated reading.
Whole-day levelDaily Pattern
FOX2 combines the daily level with the amount of movement to identify one of six patterns: low, medium, or high—each either steady or responsive.
Level + movementWhat the signal means: FOX2 detects a product of fat metabolism in your breath. It does not count calories or grams of fat burned, and dietary fat can also contribute to the signal.
What you can see
See changes the scale cannot explain.
For people losing weight—especially when appetite has changed substantially—FOX2 can show whether a low result looks stalled or is beginning to respond, and whether a high result is steady or still moving.
See when low stays low.
A low, steady pattern can help explain why your progress may feel stuck.
Notice improvement before the average rises.
A low or medium responsive pattern can show that your metabolism is beginning to move in a better direction.
Tell responsive from continuously elevated.
A high daily result means something different when your readings still rise and fall.
Using FOX2
Use it like a tracker—not a test you can fail.
Take readings when they fit your day
Every breath adds another point to the Daily Fuel Score. There is no rigid schedule to follow.
Let the whole day accumulate
Your live score shows progress toward a completed daily result; it is not meant to be judged one moment at a time.
See your daily pattern
FOX2 combines your overall level with the movement between readings: low, medium, or high—steady or responsive.
Watch the direction over time
Compare finished days to see whether your pattern is stalled, beginning to respond, or moving into a stronger range.
If a day does not contain enough information to identify movement, FOX2 simply reports “More data needed” instead of assigning a pattern.
Your day at a glance
See the movement behind your Daily Fuel Score.
The accumulated score shows your overall fat-use level. The daily graph shows whether the readings behind it stayed steady or moved between fuel states.
Level + movement
Your score tells how much. Your pattern tells how it moved.
The Daily Fuel Score remains your accumulated whole-day result. Pattern analysis adds context by showing whether the readings behind that result stayed in a narrow range or moved meaningfully.
128High + responsive
TUESDAY · COMPLETEDFUEL SIGNAL
What FOX2 tells you—and what it doesn’t.
FOX2 uses a breath-derived signal to estimate fat use. It does not directly measure insulin, resting metabolic rate, muscle loss, calories, or grams of body fat burned.
Its patterns are prompts for attention—not medical diagnoses. A higher score is not automatically better; the useful information is the combination of level, movement, and direction over time.
Already have your device?
Build a clearer picture of how your metabolism responds.
Each day adds another view of your fat-use level, your movement between readings, and the patterns that may deserve your attention.