Source: https://guthlabs.ai/docs/instruments/basal-metabolic-rate-weight-change-projector/

instrument / verified-clean

# Basal Metabolic Rate → Weight Change Projector

The current ledger marks this instrument verified clean within the source-bound verification corpus.

Status: **VERIFIED_CLEAN**Lifecycle: **verified-clean**

## Inspectable records

[01**Overview**Purpose and lifecycle](<https://guthlabs.ai/docs/instruments/basal-metabolic-rate-weight-change-projector/>)[02**Mechanism**Method and assumptions](<https://guthlabs.ai/docs/instruments/basal-metabolic-rate-weight-change-projector/mechanism/>)[03**Implementation**Binding and validation](<https://guthlabs.ai/docs/instruments/basal-metabolic-rate-weight-change-projector/implementation/>)[04**Qualification**Evidence and errata](<https://guthlabs.ai/docs/instruments/basal-metabolic-rate-weight-change-projector/qualification/>)

## Ledger state

The current ledger marks this instrument verified clean within the source-bound verification corpus.

**Area**: Biology, Medicine & Pharmacology (educational estimates only — every panel labeled not-medical-advice)

**Tranche**: tranche-5

**Evidence ID**: t5-198

**Ledger rows**: 1

No ledger note is attached.

## Review findings

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.

### Formula and scope findings

- 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.

### Unit assumptions

- 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.

## Boundary hardening

**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.

## Errata and corrections

No applied erratum is attached to this unique-name record.

## Inspectable example

4 review vectors are recorded. One source-bound sample is shown below.

````
{
  "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."
}
````

## Related workflows

No source-defined multi-instrument workflow membership is recorded.

## Sources and evidence

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

- `VERIFIED_LEDGER.json · VERIFIED_CLEAN`

- `evidence-tranche5/tranche5-results.json`

- `BOUNDARY_HAZARD_CATALOG.json`