1. Peanut actually belongs to the subfamily Papilionidae of Rosaceae. It is the seed of leguminous plants, but not a nut. However, when domestic nutritionists give dietary advice, nuts are generally divided into tree nuts and fruit seeds according to everyone's habits, and peanuts are also counted in nuts.

2. Peanut contains 25% ~ 35% protein, mainly water-soluble protein and salt-soluble protein. Water-soluble protein, also known as whey protein, accounts for about 1% of peanut protein, and salt-soluble protein accounts for 9% of peanut protein. Salt-soluble proteins mainly include peanut globulin and concomitant peanut globulin. Peanut globulin is a dimer composed of two subunits, and concomitant peanut globulin is composed of 6 to 7 subunits. There is little nutritional difference between peanut protein and animal protein, and it contains no cholesterol. The biological value of peanut protein is 58, and the protein titer is 1.7, and its nutritional value is second only to soybean protein in plant protein. Peanut fruit also contains fat, sugar, vitamin A, vitamin B6, vitamin E, vitamin K, and minerals such as calcium, phosphorus and iron. It contains eight kinds of amino acids and unsaturated fatty acids needed by human body, including lecithin, choline, carotene and crude fiber. Peanut contains choline and lecithin, which are rare in general miscellaneous grains. It can promote human metabolism, enhance memory, improve intelligence, resist aging and prolong life.