The finding is that gastric bypass surgery does not have an impact on life expectancy of the patient, only quality of life. The general trend is that the higher the BMI, the lower the life expectancy and quality of life. Males have higher life expectancies compared with females of equivalent age and BMI. That both life expectancy and quality of life both decrease with higher BMI and higher age is not surprising, and this holds up for both genders.

The latter finding is not necessary related to BMI. It is something that occurs naturally, as all people find that their age and general level of health will affect their life expectancy and quality of life. In this study, some control should have been implemented to determine the degree to which these factors are genuinely impacted by the obesity. There is an inference of causation when the authors have only truly...
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