When you are overweight, there’s added stress placed on your heart and other major organs. Obesity can cause a condition known as fatty liver and put you at risk for cirrhosis of the liver. This serious disease slows the processing of wastes and other toxins from your body. When you’re overweight, your blood pressure often rises to pump more blood to your heart. Your knees take the brunt of excess weight and can begin to cause pain. Plus, you’re at a higher risk for diabetes. Maintaining an ideal weight helps keep major organs functioning properly.