Our cells and organs are able to run smoothly when given the right amount of blood sugar. The sugar that our body needs is obtained through our dietary food choices. Whether it's in the oatmeal we had for breakfast, the sandwich at lunch or the piece of cake for dessert. The sugar we need can be found in carbohydrates. But what happens when we have too much or too little? Lets take a look at how carbohydrates can affect our blood sugar.