Meal Prep App Macro Calculator Backend API

Meal prep apps answer: "If I cook 4 containers, what are the macros each?" A meal prep app macro calculator backend API combines recipe aggregation and portion math. Calorie API provides recipe calc, food detail, and TDEE targets.

Meal Prep User Stories

Backend Flow

1. POST /calc/recipe → batch totals
2. Divide by containers → per-meal macros
3. Save meal templates in your DB
4. Client logs one container → store as food_log row

Recipe Calc Then Split

const recipe = await fetch(`${BACKEND}/api/recipe-calc`, {
  method: 'POST',
  body: JSON.stringify({
    servings: 5,
    ingredients: [
      { query: 'ground turkey', quantity: 900, unit: 'g' },
      { query: 'brown rice cooked', quantity: 400, unit: 'g' },
    ],
  }),
}).then(r => r.json());

const perContainer = {
  calories: recipe.totals.calories / 5,
  proteinG: recipe.totals.protein_g / 5,
  carbsG: recipe.totals.carbohydrates_g / 5,
  fatG: recipe.totals.fat_g / 5,
};

Portion Scaling Single Foods

For simple prep (same chicken daily):

const detail = await getFoodById(chickenId);
const macros = scalePer100g(detail, gramsPerContainer);

Use portion scaler patterns from calc API docs.

Caching Batch Templates

Meal templates change rarely. Cache recipe calc results 24h in Redis keyed by ingredient hash.

Related Verticals

• Recipe blog labels
• Gym macro tracking
• Weight loss coaching SaaS

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