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Did I not read this right, or is there no methodology given?
The only way a study like this has real meaning is if wages are compared apples to apples. So if an overweight lawyer lady makes less than a slim lawyer lady, and they have the same job title, education, experience and responsibilities, well, there's some real lousy business going on.
But if this study pooled women's wages in aggregate, I can't see how this illuminates anything. It doesn't take research to know that women who make more money eat higher-quality food, take better care of themselves in terms of exercise, smoking, drinking, etc., and make a greater effort to stay slim to fit the profile (literally) of their higher-powered careers.