Blood sugar or glucose level can be high due to not making insulin properly in the body or not using insulin properly. Diabetes is a metabolic syndrome that is associated with many diseases. This affects every part of the body. Diabetes increases the risk of heart diseases, chest pain, heart attack, stroke and having sugar in the arteries are its main symptoms. The risk of Alzheimer's increases in type 2 diabetes, the risk of kidney failure also increases by 50 percent. The increased sugar caused by diabetes affects the nerves that supply blood to the brain, due to which some part of the brain can be damaged and memory loss can also occur. High blood sugar can have a bad effect on the eyes by damaging the nervous and circulatory systems.