Body_Weight_Lecture_Fall08_WebCT

Body_Weight_Lecture_Fall08_WebCT - Body Weight Dr Elizabeth...

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Body Weight Dr. Elizabeth Mendell HPRB 1710 Fri, Sept 19 2008
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Previous Lecture Review: Cardiovascular Disease CVD background Website: Women and CVD facts Part I: Cardiovascular System Overview Heart facts; heart structure and function The blood vessels The cardiovascular system (the heart + blood vessels) Part II: Cardiovascular Disease (CVD) CVD definition CVDs we will be covering in this lecture: coronary artery disease, heart attack, stroke You are responsible for reading Ch 21 (the entire chapter).
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Today’s Lecture Overview Ways to evaluate body weight: BMI , % body fat, body fat distribution Factors that influence weight: Genetics, gender, age, food environment, lifestyle (cars, TV, computers), stress Overweight & obesity Overweight & obesity facts Overweight & obesity in minority populations: health disparities Is obesity contagious Weight Control: Bariatric surgery, medication, dieting The size acceptance, non-diet movement
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BMI: Body Mass Index One way to evaluate weight and overweight. Represents height-to-weight ratio BMI = kg/m 2 Overweight: BMI 25 – 29 Obese: BMI greater than 30 Critics: does not take body composition into account; muscle is heavier than fat, and muscular person may have same BMI as overweight or obese person.
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% Body Fat Another way to evaluate weight and overweight. Body composition measured in terms of % body fat. No clear accepted guidelines for healthy ranges, but in general: 12-20% is healthy range for men 20-30% is healthy range for women In general, % body fat increases with age.
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Body Fat Distribution Another way to evaluate weight and overweight. The distribution of body fat is important in determining health risk. Waste-to-hip ratio: one way to judge location of body fat. Apple shaped: carry weight mainly around and above waist (higher waste-to-hip ratio). Pear shaped: carry weight mainly in hips and thighs (lower waste-to-hip ratio).
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Factors that Influence Weight Genetics Age Gender Food Environment Lifestyle: Cars, TVs, Computers Stress
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Factors that Influence Weight: Genetics Scientists now believe that each individual has a genetically determined weight range, spanning perhaps 30 lbs. Remember that genetics influences weight (but does not explain it entirely): Twin studies support genetic tendency towards obesity. If both your parents are obese, you have 80% chance of becoming obese. Genetics alone is not the culprit in weight & obesity: Pima Indians in Mexico vs. US
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Factors that Influence Weight: Gender Hormonal influences of puberty: Boys & girls basically the same in terms of % body fat before puberty: 12% body fat.
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