Basal Metabolic Rate → Weight Change Projector mechanism

Model scope

The supplied honest label appropriately identifies the model as simplified, nonlinear in reality, adaptive, and not medical advice. Before release, define the signed input convention, duration-unit handling, rounding policy, and whether the product should be renamed or relabeled because BMR is not computed or used.

• The formula is a rough static approximation, not a universally exact conversion; 7700 kcal/kg is an assumed energy-density estimate and real weight change is nonlinear and adaptive.
• The instrument name claims Basal Metabolic Rate, but the supplied formula does not use BMR or any basal metabolic rate input.
• The sign convention for daily caloric deficit/surplus is unspecified. The formula requires a signed energy balance (surplus positive, deficit negative) to produce weight gain as positive and weight loss as negative; entering deficit as a positive magnitude would reverse the result.

Units and conventions

• 7700 means approximately 7700 kilocalories per kilogram of body-weight change.
• Daily caloric balance is expressed in kcal/day.
• Duration must be converted to days before multiplication; 1 week is assumed to equal 7 days.
• A caloric surplus is positive and a caloric deficit is negative.
• Projected weight change is reported in kilograms, with negative values meaning weight loss and positive values meaning weight gain.

Inspectable vector

One of 4 source-bound review vectors:

{
  "inputs": {
    "daily_caloric_balance_kcal_per_day": -500,
    "duration": 14,
    "duration_unit": "days"
  },
  "expected_outputs": {
    "total_energy_delta_kcal": -7000,
    "projected_weight_change_kg": -0.9090909
  },
  "working": "1. Daily balance = -500 kcal/day. 2. Duration = 14 days. 3. Total energy change = -500 × 14 = -7000 kcal. 4. Projected weight change = -7000 ÷ 7700 = -0.9090909 kg."
}

Failure boundary

BREAK_CLAIMED · SELF_FLAGGED

An extreme but syntactically numeric input causes JavaScript floating-point overflow during daily_caloric_balance_kcal × duration_days, producing Infinity and therefore no valid finite projected weight. The instrument should reject or explicitly flag the result.

Other records

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json
• evidence-tranche5/tranche5-results.json
• BOUNDARY_HAZARD_CATALOG.json