Diabetic patients can eat reishi properly because it is a fungus rich in protein, amino acids, vitamins and trace elements, especially the trace element selenium, which can increase the body’s resistance. However, it is recommended that diabetics should not take more than 20g of Reishi per day as it has a certain amount of calories and may cause an increase in blood sugar. diabetics should continue to strictly control their diet and exercise while eating Reishi and should not stop taking hypoglycemic drugs and should monitor their blood sugar.