Zhangqiu specialty thin-skinned walnut is a famous specialty in Shandong, with unique flavor and high nutritional value. The nucleolus is shaped like a human brain and is rich in essential trace elements such as calcium, phosphorus, iron, manganese and zinc, as well as nutrients such as protein carbohydrates, riboflavin and carotene. In particular, unsaturated fatty acids in nucleoli are beneficial to reducing cholesterol content and preventing cerebral hemorrhage, and are known as "brain gold". According to Compendium of Materia Medica. Walnut has the effects of "benefiting qi and nourishing blood, moistening throat and resolving phlegm, warming lung and moistening intestine". Modern medical research has proved that walnut is a very beneficial health food, which can strengthen brain, improve intelligence, moisten muscles and blacken hair.