17. Kalkulator kaloryczny

const PRODUCTS = [
  { id: 1, name: 'Jajko', kcal: 70, protein: 6, carbs: 0.6, fat: 5, per: '1 szt (60g)' },
  { id: 2, name: 'Ryż biały', kcal: 130, protein: 2.7, carbs: 28, fat: 0.3, per: '100g' },
  { id: 3, name: 'Pierś kurczaka', kcal: 165, protein: 31, carbs: 0, fat: 3.6, per: '100g' },
  // ... minimum 30 produktów
];

function calculateMealNutrition(product, grams) {
  const factor = grams / 100;
  return {
    kcal: Math.round(product.kcal * factor),
    protein: (product.protein * factor).toFixed(1),
    carbs: (product.carbs * factor).toFixed(1),
    fat: (product.fat * factor).toFixed(1),
  };
}