1, walnuts are dry goods, so it is no problem to keep them fresh in the refrigerator for a long time. Cut the walnut kernel before use to see if the meat turns yellow. You can't eat it if you have it, because yellow walnut kernel will produce aflatoxin, which seriously affects the function of human liver and internal organs.

2. Walnut is rich in nutritional value, and has the reputation of "Long live the son", "longevity fruit" and "treasure of health preservation". 86% of the fat in walnuts is unsaturated fatty acid. Walnut is rich in copper, magnesium, potassium, vitamin B6, folic acid and vitamin B 1, and also contains fiber, phosphorus, nicotinic acid, iron, vitamin B2 and pantothenic acid. Every 50g walnut contains 3.6% water, 7.2g protein, 3 1g fat and 9.2g carbohydrate.