In general, a mild increase in blood sugar does not lead to a decline in the sexual function of men, but when the increase in blood sugar is obvious or even diabetes, this can lead to a decline in the sexual function of men in the long run. When the blood sugar is mildly elevated and does not cause the system to react abnormally, this will not lead to a decline in the sexual function of men. The actual fact is that you should take measures to control your blood sugar in your daily life, such as a low-sugar diet and increased exercise, to prevent the development of diabetes. If the blood sugar is high, or even has been diagnosed with diabetes, with the development of the disease, men can appear to decline in sexual function. First, diabetic patients due to their own hormone level disorder, poor blood sugar control can lead to reduced kidney function, hormone levels, resulting in sexual function decline; second, patients in a long-term high blood sugar state, can damage peripheral nerves, blood vessels, autonomic nerve dysfunction, resulting in men may not be erect, impotence, affecting sexual function. Therefore, when there is an increase in blood sugar, you should try to control the blood sugar level under the guidance of a doctor to avoid diabetes, which affects your health.