Diabetes mullites, or simply diabetes, is a group of metabolic diseases in which a person has high blood sugar, which is hardly to be healed. Untreated, diabetes can cause many complications. The one who suffers diabetes may experience loss of weight, polyuria , polydipsia and polyphagia. Commonly, diabetic retinopathy, which affects blood vessel formation in the retina of the eye, can lead to visual symptoms, reduced vision, and potentially blindness. So in order to get diabetes in mid ages, people, especially obesity people must eat lower sugar food. And drink some tea to help with eyesight. Also doing exercise is a good way to increase immune system.