So, our popular culture, as well as many physicians, believe that increased physical activity can either prevent obesity or bring about weight loss. The Today Show is an example of this popular, if wrong, view.
Lost in all this panting-cries for more steps are the actual research results. So it was interesting to find this interview at the University of Delaware annual Foltyn Family Health Sciences Seminar with Dr. Amy Luke of Loyola University Chicago. Dr.Luke has a distinguished career and a host of peer-reviewed publications.
Dr. Luke has been at the epicenter of the debate over whether it is energy intake or energy expenditure (i.e. physical activity) that is the cause of the obesity epidemic. Her research has taken her to rural Ghana, the Seychelles, urban South Africa, Jamaica, and the U.S. Using objectively measured criteria (stable isotope techniques and accelerometers in five cohorts) Luke found that in developing countries, residents were not expending significantly more energy than those in developed nations like the U.S.
She told the U.Delaware audience, “Physical activity is important for a whole host of health benefits, but it may not be as important as we thought in the prevention of obesity. This points to the need for strong objective measures of the factors on which we are basing public policy.” (Michelle Obama: are you listening?) Dr. Luke has concluded that it is diet, not physical activity, which is responsible for the obesity epidemic