Sven (AAMOS AI)
108 lines
3.0 KiB
TypeScript
108 lines
3.0 KiB
TypeScript
import type { ActivityLevel, DailyTargets, GoalType, Sex } from "@app/shared-types";
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/**
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* Energiberäkning enligt Mifflin–St Jeor. Detta är vägledning baserad på
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* officiella rekommendationer – Appen är inte medicinsk rådgivning (spec §6, §21).
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*/
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export interface EnergyProfile {
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sex: Sex;
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age: number;
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heightCm: number;
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weightKg: number;
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activityLevel: ActivityLevel;
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primaryGoal?: GoalType | undefined;
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}
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const ACTIVITY_FACTORS: Record<ActivityLevel, number> = {
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sedentary: 1.2,
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light: 1.375,
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moderate: 1.55,
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active: 1.725,
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very_active: 1.9,
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};
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/** Justering per mål (kcal/dag). Konservativa, väldokumenterade nivåer. */
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const GOAL_ADJUSTMENTS: Partial<Record<GoalType, number>> = {
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lose_weight: -500,
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gain_weight: 400,
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build_muscle: 250,
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maintain_weight: 0,
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};
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/** Lägsta rekommenderade energiintag – under detta kapas aldrig målet (säkerhetsgolv). */
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const MIN_KCAL = 1200;
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export function bmrMifflinStJeor(
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p: Pick<EnergyProfile, "sex" | "age" | "heightCm" | "weightKg">,
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): number {
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const base = 10 * p.weightKg + 6.25 * p.heightCm - 5 * p.age;
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if (p.sex === "male") return base + 5;
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if (p.sex === "female") return base - 161;
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// Ospecificerat: medelvärde av formlerna, transparent redovisat i UI.
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return base - 78;
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}
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export function tdee(p: EnergyProfile): number {
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return bmrMifflinStJeor(p) * ACTIVITY_FACTORS[p.activityLevel];
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}
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export interface DailyTargetsResult {
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targets: DailyTargets;
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basis: {
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bmrKcal: number;
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tdeeKcal: number;
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goalAdjustmentKcal: number;
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activityLevel: ActivityLevel;
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};
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}
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/**
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* Dagsmål: energi via TDEE + måljustering; protein per kg kroppsvikt;
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* fett som andel av energi; kolhydrater = resten; fiber 3 g/MJ (nordisk rekommendation);
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* salt max 6 g/dag.
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*/
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export function computeDailyTargets(p: EnergyProfile): DailyTargetsResult {
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const bmr = bmrMifflinStJeor(p);
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const maintenance = tdee(p);
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const adjustment = GOAL_ADJUSTMENTS[p.primaryGoal ?? "maintain_weight"] ?? 0;
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const kcal = Math.max(MIN_KCAL, Math.round(maintenance + adjustment));
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const proteinPerKg =
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p.primaryGoal === "build_muscle" || p.primaryGoal === "more_protein"
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? 1.8
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: p.primaryGoal === "lose_weight"
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? 1.6
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: 1.2;
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const proteinG = Math.round(p.weightKg * proteinPerKg);
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const fatShare = p.primaryGoal === "less_fat" ? 0.25 : 0.3;
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const fatG = Math.round((kcal * fatShare) / 9);
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const carbsKcal = Math.max(0, kcal - proteinG * 4 - fatG * 9);
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const carbsG = Math.round(carbsKcal / 4);
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// 3 g fiber per MJ (1 MJ ≈ 239 kcal)
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const fiberG = Math.round((kcal / 239) * 3);
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return {
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targets: { kcal, proteinG, carbsG, fatG, fiberG, saltMaxG: 6 },
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basis: {
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bmrKcal: Math.round(bmr),
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tdeeKcal: Math.round(maintenance),
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goalAdjustmentKcal: adjustment,
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activityLevel: p.activityLevel,
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},
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};
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}
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/** Standardmål när profil saknas (visas tydligt som schablon i appen). */
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export const DEFAULT_TARGETS: DailyTargets = {
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kcal: 2000,
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proteinG: 80,
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carbsG: 220,
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fatG: 67,
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fiberG: 25,
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saltMaxG: 6,
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};
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