Got a big belly? You might have diabetes! Our friend Dr. Mehmet Oz says belly fat is just one of the clues you may be diabetic or at high risk! Diabetes is a life-long condition that can lead to blindness, heart disease, stroke, kidney failure, amputations and nerve damage. Dr. Oz estimates a whopping 81 million people are diabetic or on the verge, but he says early detection can double a diabetic's chances of survival.So, how do you know if you have diabetes or if you're at risk? Dr. Oz says there are four major symptoms: Uncontrollable thirst, excessive urination, weakness and fatigue, and belly fat! So how much belly fat is too much? Dr. Oz has a formula to determine if you have too much belly fat - and this works for men, women and kids: Take your height in inches and divide that in half. If your waist size is more than half your height, you're at risk for developing diabetes. There are things you can do to drop the weight, keep it in check, and reduce your risk of diabetes by 90 percent: First, have fiber for breakfast! Good choices include a high-fiber cereal, oatmeal or a piece of fruit. Another thing you can do to lose belly fat is never eat on an empty stomach - or you'll overeat! Dr. Oz says, hormonally, when you eat when you're absolutely starving, you'll overeat. So about half an hour before a meal, eat something small but filling, like a handful of nuts, a piece of fruit - something light just to take away the edge. Also, stay away from white foods like white sugar, white flour and white pasta. In the body, these are all seen as simple carbohydrates, which are generally deposited as belly fat. Finally, Dr. Oz says it's important to build muscle - because it burns a lot more calories than fat will. Dr. Oz says, if you follow these tips, 90 percent of people who are pre-diabetic can reverse their symptoms dramatically, and those with diabetes can actually reverse the disease.