Type 2 diabetes (non-insulin-dependent diabetes mellitus, NIDDM) is a metabolic disorder where the cells of the body have lost the ability to effectively utilize the insulin produced by the pancreas. This is known as insulin resistance. Type 2 diabetes used to be called adult-onset diabetes, because it primarily affected older adults. But today with more children being overweight and sedentary, Type 2 diabetes is affecting them as well as adults.
Type 2 diabetes is a combination of insulin resistance and inflammation. Insulin resistance and inflammation prevent your body's cells from effectively using the insulin produced by the pancreas. That is, the insulin receptors on the surface of each cell are damaged (inflamed), ignoring the presence of insulin in your blood and refusing to allow glucose from your blood to enter your cells. The cells in your body require the glucose (as fuel) in order to produce energy. Without this fuel, your cells cannot produce energy and you will feel tired. This is one of the primary reasons why many diabetics lack the energy to exercise or feel the need to take a nap in the middle of the day.