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A Biological And Evolutionary Perspective On Weight Loss And The Diet Calories

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Name: Nayab Ahmad Date: November 5, 2014 Paper title: A Biological and Evolutionary Perspective on Weight Loss and the “Calories-in-Calories-out Model” INTRODUCTION AND BACKGROUND Obesity Epidemic in the United States Obesity, defined as an excess of body fat, has become a serious public health concern in the United States (Morrill and Chinn 2004). Obesity rates in the United States have more than doubled since the 1960s, where one in eight men and women were estimated to be obese (Fryar et al. 2012). The prevalence of obesity has now jumped to more than one in three men and women in the United States (Ogden et al. 2014; Flegal et al. 2012). This rate has remained the same since 2003 and is seen for both men and women of all ages and in every racial or ethnic group (Ogden et al. 2013; Simon et al. , 2006). Obesity has become a public health problem today because it exacerbates three societal issues: physical health, mental health, and economic costs. To begin, obesity has been shown to have negative health effects throughout the entire body. It increases risk for cardiovascular disease, hypertension, type 2 diabetes, arthritis, and numerous types of cancer (NIH 1998; van Dam 2007). Indeed, it is projected that 5% to 15% of deaths in the United States every year is due to obesity (Steward et al. 2009). Along with increased health risks to the individual, obesity is linked to mental health issues including depression and poor self-esteem (Wardle and Cooke 2005). In

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