Obesity Surgery Royston

Mr John Fleischl - Specialist Bariatric Surgeon

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About Obesity

Obesity: a disease

Obesity means that you have an unhealthy amount of body fat. Everyone needs some body fat, but too much fat can cause health problems. Obesity is an excess of total body fat, which results from caloric intake that exceeds energy usage. Obesity is emerging as a health epidemic around the world. According to the Centres for Disease Control and Prevention, obesity is rapidly spreading across all regions and demographic groups. An estimated 97 million adults in the United States are overweight or obese. That figure represents more than 50% of the American adult population. Of this group, 11 million adults suffer from severe obesity. In New Zealand Obesity is creating a similar toll on society.
A measurement used to assess health risks of obesity is Body Mass Index (BMI). Click here to find out more about BMI.

The American Obesity Association reports that obese individuals have a 50-100% increased risk of death as compared to normal weight individuals, with 300,000 to 587,000 deaths each year attributable to their obesity. This substantial increase in health risks has made obesity the second leading cause of preventable death in the United States.


The main causes of being overweight or obese are eating too much and/or not being active enough. If you eat more calories than your body burns up, the extra calories are stored as fat. Everyone has some stored fat. Too much fat results in being overweight or obese. Other factors that may affect your weight include your genes (obesity tends to run in families), your metabolism (how your body processes food), your racial/ethnic group, and your age. Your surroundings and psychological factors may also play a part. Sometimes an illness or medicine can contribute to weight gain. Researchers are studying the causes of obesity to learn more about how to prevent and reverse it.

About Obesity   |   Consequences   |   Treatment Options
Body Mass Index   |   Useful Links

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