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Fitness Tools

Adaptive TDEE

Tool id: adaptive-tdee · Methods: regression, endpoints

Formula TDEE (the tdee tool) estimates; this tool measures. Given 2+ weeks of daily weight and intake logs it computes the TDEE that actually explains your weight change, using the energy-balance identity TDEE = mean intake − stored energy (Wishnofsky: 7700 kcal per kg of body-mass change).

Input

Section titled “Input”
FieldTypeNotes
entriesarray (10–400)one per day: { date, weight, kcal }
entries[].datestringYYYY-MM-DD; gaps are fine, duplicates are an error
entries[].weight{ value, unit }kg or lb
entries[].kcalnumbercalories logged for that date
window_daysinteger3–14, default 7 — smoothing window for endpoints
methodsstring[] | "all"defaults to "all"

Methods

Section titled “Methods”
  • regression — OLS slope of weight over the whole series; robust to gaps.
  • endpoints — compares the mean of the first and last window_days of weights; requires a date span of at least 2 × window_days, otherwise it is skipped.

Data sources: on the Claude iOS app, the native Apple Health integration supplies weight and dietary energy directly; elsewhere, paste an export from your logging app.

Example

Section titled “Example”
import { REGISTRY } from "@almostjacked/fitness-tools";
const at = REGISTRY.get("adaptive-tdee")!;
at.compute(at.input.parse({
  entries: [
    { date: "2026-01-01", weight: { value: 80, unit: "kg" }, kcal: 2500 },
    // ... one entry per day, 10+ total
  ],
}));
 
{
  "results": [
    {
      "method": "regression",
      "value": 2885,
      "unit": "kcal/day",
      "detail": {
        "mean_intake_kcal": 2500,
        "weight_change_kg_per_week": -0.35,
        "span_days": 14,
        "n_entries": 14,
        "kcal_per_kg": 7700
      }
    },
    {
      "method": "endpoints",
      "value": 2885,
      "unit": "kcal/day",
      "detail": {
        "mean_intake_kcal": 2500,
        "weight_change_kg_per_week": -0.35,
        "span_days": 14,
        "n_entries": 14,
        "kcal_per_kg": 7700
      }
    }
  ],
  "consensus": {
    "mean": 2885,
    "median": 2885,
    "min": 2885,
    "max": 2885,
    "n": 2
  },
  "skipped": []
}

Call it another way

Section titled “Call it another way”

Full docs for the other protocols: HTTP API · MCP server.