One of the most serious diseases is called obesity, which is an excessive amount of body fat on a person. There is a scale called the body mass index [BMI] scale that can measure body fat and see if a person is classified as obese (Warkentin 3). The scale uses a person's height and weight to generate an estimate of the amount of body fat to calculate BMI. Obesity is a disease that can alter the structure of the heart and its functioning. According to Warkentin, “The more you weigh, the more blood flows through your body. The heart has to work harder to pump excess blood” (3). Over time, this can overload the heart and can even cause heart failure. The chance of contracting many diseases and heart failure can be greatly reduced by maintaining a healthy weight. Even if a person already has heart disease, losing weight and eating properly will reduce the risk of other heart problems (Warkentin