The nutritional value of soybean is second only to meat, milk and eggs, so it has the reputation of "plant meat". Soybean is rich in nutrition and is a kind of food containing high-quality plant protein. Both edible and bean products are very beneficial to health. The contents of protein, fat, calcium, phosphorus, iron, vitamins and other nutrients are higher than those of cereals and potatoes, even as high as 8 times, and only the sugar is low.

Soybean contains about 40% protein and 20% fat, while the protein contents of beef, chicken and fish are 20%, 2 1% and 22% respectively.

Soybean protein contains many kinds of amino acids, especially the essential amino acids that cannot be synthesized by human body. The contents of lysine and tryptophan are relatively high, accounting for 6.05% and 1.22% respectively. The nutritional value of soybean is second only to meat, milk and eggs, so it has the reputation of "plant meat".

Main categories:

Soybean generally refers to its seeds. According to the color and grain shape of seed coat, soybeans can be divided into four categories: yellow soybeans, green soybeans, black soybeans and feed beans.

Soybean is the most widely planted variety in soybean. Soybean is most commonly used to make various bean products, brew soy sauce and extract protein. Bean dregs or ground into coarse powder are also commonly used in livestock feed.

Green beans are soybeans with turquoise seed coats. According to the color of its cotyledons, it can be divided into two types: green-skinned and green-kernel soybeans and green-skinned Ren Huang soybeans. Green beans are rich in unsaturated fatty acids, soybean lecithin, saponins, protease inhibitors, isoflavones, molybdenum, selenium and other anticancer components, as well as protein and fiber.

Black beans are black seeds of leguminous soybeans. Also known as beans and black beans, it tastes sweet and flat. Black beans have the characteristics of high protein and low calorie, with black skin and yellow or green inside.

Feed beans (feed beans): Generally, the seeds are small and oblong, and there are pits on two leaves, and the seed coat is slightly shiny or dull. The sensory quality index of soybean also requires that the limit of heterochromatic grains is 5%, and the limit of feed beans (edible beans) is 1%, and other substances shall not be mixed.