1. By time: daily recipes and weekly recipes.

2. According to the crowd: individual recipes, collective recipes.

3. According to the purpose: ordinary recipes and special recipes.

Whether the food is nutritious: 1. Nutrients in food; 2. Content of corresponding nutrients

Nutrition data table: 10 kinds of energy, moisture, ash, dietary fiber and macro nutrients, 15 kinds of vitamins,1/kloc-0 kinds of minerals, 38 kinds of fatty acids and 20 kinds of amino acids.

Coding rule: category+subcategory+serial number

Edible part: according to people's usual processing, cooking methods and eating habits, after removing the inedible part, the rest is the edible part of food.

Market commodity: food bought in the market.