The world Health Organization describe obesity as "an escalating epidemic" and one of the greatest neglected public health problems of our time. It is estimated that nearly 68% of adult Americans are now overweight and over 34% are actually considered obese. Obesity increases the risks of hypertension, heart disease, and diabetes in those who are genetically predisposed, and has also been associated with gallbladder disease and breast cancer. Define a healthy weight. What are the leading causes of obesity? List diet planning strategies for successful weight loss.