Outlier resistance
One unusual weigh-in should not create a large estimate or target change.
Adaptive TDEE
Energy out is estimated, then tested against what happens over time.
Total daily energy expenditure (TDEE) is an estimate of the energy your body uses across a day—the “calories out” side of calorie balance. Quevro is being built to learn it gradually from your own longitudinal data, rather than treating a one-time calculator or wearable number as permanent truth.
The starting point
Begin with a baseline. Label it clearly.
Quevro plans to calculate an initial basal metabolic rate using the Mifflin–St Jeor equation, then apply a general activity factor. This provides a reasonable onboarding estimate while the app has no personal history.
It is not a direct measurement of metabolism. Personalization begins only after enough usable intake and weight observations accumulate.
Initial estimateBMR × activity context
Time + observations
Learned estimateIntake ↔ trend weightSignal hierarchy
Not every input gets the same vote.
Quevro’s planned model prioritizes what can be observed across time. Activity helps explain the day, but intake, trend weight, and time do more of the long-term learning.
SignalPlanned roleWhy it matters
Calorie intake Primary
Complete daily totals provide the energy-in side of the relationship. Missing or partial logs reduce confidence.
Trend weight Primary
A smoothed trend helps distinguish direction from normal water and measurement noise.
Elapsed time Primary
Patterns observed across 7, 14, 21, and 28-day windows are more informative than isolated days.
Coverage & quality Qualifier
Weigh-in coverage, intake completeness, missing days, and data flags determine how much trust to place in the estimate.
Apple Health activity Supporting
Steps, workouts, and available energy data can explain context, but should not be double-counted or treated as exact.
The core relationship
From logged intake to net energy balance.
Quevro plans to estimate calories out from a baseline, then refine that estimate using the relationship among logged intake, smoothed weight trend, and elapsed time. Calories in minus estimated calories out produces a working view of net energy balance: likely deficit, near-balance, or surplus.
This is a model, not calorimetry or a promise of weight change. Short windows can be distorted by hydration, glycogen, sodium, digestion, illness, and logging error.
Calories in−Estimated calories out=Net energy balancedeficit · near-balance · surplusEstimated over time—not a direct physiological measurement.
Confidence model
Confidence describes the evidence, not the person.
Levels are planned to respond to observation duration, log completeness, weigh-in coverage, agreement across windows, and recent data quality.
- 1
Learning
The estimate is still anchored mostly to onboarding inputs.
- 2
Low
Some usable observations exist, but gaps or limited time constrain the model.
- 3
Moderate
A steadier intake and weight-trend pattern is becoming visible.
- 4
High
Multiple windows agree and recent data quality remains strong.
Built-in restraint
Guardrails before recommendations.
Conservative bounds
Proposed estimates are planned to stay within physiologically conservative ranges.
Smooth updates
New information is incorporated over time instead of replacing the prior estimate abruptly.
Phased targets
Large calorie-target changes are intended to arrive gradually with an explanation.
Visible data gaps
Incomplete days lower confidence and should not masquerade as unusually low intake.
Historical snapshots
Estimates, inputs, confidence, and quality diagnostics are planned to be retained for context.
Limits matter
What the estimate cannot tell you.
Quevro cannot directly measure metabolism or determine why weight changed. Even a high-confidence estimate can be affected by unlogged intake, fluid shifts, travel, training changes, illness, medication, pregnancy, and other factors.
Quevro is not a medical device and is not intended to diagnose, treat, cure, or prevent any disease. Calorie targets and projections are informational estimates, not medical advice. People with a medical condition, a history of disordered eating, pregnancy-related needs, or concerns about nutrition or weight should consult a qualified health professional.
Questions about the approach? Contact us