import type { FoodCategory } from "../types/food";
/**
 * Calculate CO2 emissions for food consumption
 * @param category - Food category
 * @param label - Specific food item
 * @param kg - Weight in kilograms
 * @returns CO2 emissions in kg
 */
export declare function co2PerKg(category: keyof FoodCategory, label: string, kg: number): number;
/**
 * Get data source for a specific food item
 * @param category - Food category
 * @param label - Specific food item
 * @returns Data source reference
 */
export declare function dataSource(category: keyof FoodCategory, label: string): string;
/**
 * Get all available food categories
 * @returns Array of food category names
 */
export declare function getFoodCategories(): string[];
/**
 * Get all food items in a specific category
 * @param category - Food category
 * @returns Array of food item names
 */
export declare function getFoodItems(category: keyof FoodCategory): string[];