Some of the complications include those with the heart, circulation, blood vessels, kidneys and even eyesight. Because of the high blood glucose levels, a person with diabetes risks having problems with their eyesight. Eye complications of diabetes include those affecting the retina, the vitreous, the lens and the optic nerve. We often think of diabetics as being people with a sweet tooth who crave sugar. This is not the case. More often, a person who is obese has more of a chance of getting diabetes than a person who maintains his or her weight. One way how to prevent diabetes is by managing your weight. Although there is little you can do about having a genetic disposition to the disease, there are ways you can prevent becoming one of the millions of Americans who develop diabetes each year. When the wound does not heal and the infection begins to spread, gangrene can set in. Gangrene can kill a person, and the doctor knows this. So the person with diabetes has a choice, they can either lose their toe or their life. In most cases, they choose to lose the toe. In some cases, however, the gangrene has already spread to the foot. Today, insulin to treat diabetes is human insulin and is much more effective than insulin used in the past. There are many different types of insulin on the market today and, as is the case with oral medications, it may take several different insulin types in order to find the correct balance that will insure good glucose levels. While people with diabetes need to avoid sugar as they have an abundance of glucose in their blood, those with hypoglycemia have low glucose levels and need to replenish the sugar or glucose in their blood. In many cases, those with diabetes may develop hypoglycemia as a reaction to insulin or diet. This is different than someone who experiences hypoglycemia on an occasional basis, usually the result of not eating properly. This concept was developed to help people who wanted to rank carbohydrates based upon how they affected the blood glucose levels. Different carbohydrates are absorbed into the system in different manners and all take different times to break down and digest. Carbohydrates that break down and cause rapid digestion tend to leave the most glucose in the blood stream and cause the most damage to a person who is a diabetic.