A recent article published in the Sydney Morning Herald looks at why diet and exercise just aren't enough by themselves to combat obesity. "Studies suggest obese adults who modified their diet and exercise lost less than five kilograms within two to seven years, while those who took who had surgery reported weight loss of 25-75 kilograms within two to four years of the (gastric banding) procedure". The article points toward the underlying genetic basis for obesity, and quotes a number of leading Australian experts who are calling for weightloss surgery to be made more available to the community, especially those with diabetes.
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