Eating walnuts has the benefit of protecting the cardiovascular system. Walnut contains a lot of unsaturated fatty acids, which can promote the decomposition of fat and cholesterol in the body, so it has a certain preventive effect on the cardiovascular system. Walnuts can also accelerate the production of insulin in the body and control the absorption of sugar by the human body, which is good for diabetics. Eating walnuts can also enhance people's memory, improve the activity of brain cells, make people smarter and relieve brain fatigue. However, it should be noted that walnuts can't be eaten too much, which will easily increase the burden on the stomach and cause bloating and nausea. Moreover, walnuts contain a lot of fat, and eating more will make people fat.