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Top experts talk about why obesity is so strongly linked to the four major causes of death in the US—heart disease, cancer, stroke, and type 2 diabetes. Discover the many disorders associated with obesity: infertility, back pain, Alzheimer’s disease, sleep apnea, and more. Find out what your BMI is and why it matters. You’ll see why our bodies aren’t suited to our modern way of life. Learn how we respond to the wrong cues when we eat and ignore our natural, internal cues. Journey inside your blood vessels and see, on a microscopic level, exactly what happens when you overeat. Witness how fat cells transform from tiny individual cells into a massive tissue. How do we change the tide? Dieting is not the answer! You’ll find out how to make little changes in your life that add up to big ones.


Obesity means having too much body fat. It is different from being overweight, which means weighing too much. The weight may come from muscle, bone, fat, and/or body water. Both terms mean that a person's weight is greater than what's considered healthy for his or her height.

Obesity occurs over time when you eat more calories than you use. The balance between calories-in and calories-out differs for each person. Factors that might affect your weight include your genetic makeup, overeating, eating high-fat foods, and not being physically active.

Being obese increases your risk of diabetes, heart disease, stroke, arthritis, and some cancers. If you are obese, losing even 5 to 10 percent of your weight can delay or prevent some of these diseases. For example, that means losing 10 to 20 pounds if you weigh 200 pounds.

NIH: National Institute of Diabetes and Digestive and Kidney Diseases

The material on this site is for informational purposes only and is not intended as medical advice. It should not be used to diagnose or treat any medical condition. Consult a licensed medical professional for the diagnosis and treatment of all medical conditions and before starting a new diet or exercise program. If you have a medical emergency, call 911 immediately.