A diet high in unhealthy fats, calories and sugars along with an absence of systematic physical activity can definitely contribute to the risk factors for metabolic syndrome. Overweight people have a tendency to develop a resistance to insulin - a hormone that controls blood sugar levels, pushing sugar into the body's cells, where it is used for energy. When you're impervious to insulin, blood sugar isn't efficiently transported into the cells. That leads to high blood-sugar levels in the bloodstream, which is one of the symptoms of type 2 diabetes.