class_15_2010_notes

class_15_2010_notes - IB35 Human Biological Variation Class...

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1 IB35 Human Biological Variation Class #15 Topics for today: Thrifty Genotypes? Obesity and Hypertension What people look like • Skin color •Ha i r • Eyes • Body shape • Body fat Measuring Body Fat • Hydrodensitometry (underwater weighing) – Measures whole body density by determining body volume •Ca l ipers (anthropometry – skinfold measurements) • DEXA (dual energey x-ray absorptiometry) – Whole body scanner that has two low dose x- rays at different sources that read bone and soft tissue mass simultaneously BMI: The Body Mass Index BMI Categories Underweight < 18.5 Normal weight = 18.5 – 24.6 Overweight = 25 – 29.9 Obesity > 30 5’2” 100lbs BMI = 18.3 5’2” 120lbs BMI = 21.9 5’2” 140lbs BMI = 25.6 5’8” 120lbs BMI = 18 2 www.nhlbisupport.com/bmi 58 120lbs BMI = 18.2 5’8” 150lbs BMI = 22.8 5’8” 180lbs BMI = 27.4 6’2” 140lbs BMI = 18.0 6’2” 150lbs BMI = 19.3 6’2” 200lbs BMI = 25.7 Restricted Calorie Diets Canto Owen (at ~ 26 years of age)
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2 The Health Risks of Obesity • Heart disease and stroke • High blood pressure • Diabetes • Cancer Gallbladder disease and gallstones • Gallbladder disease and gallstones • Osteoarthritis • Gout • Breathing problems, such as sleep apnea (when a person stops breathing for a short time during sleep) and asthma The Health Risks of Obesity Table 1. Prevalence of Medical Conditions by Body Mass Index (BMI) for Men Medical Condition Body Mass Index 18.5 to 24.9 25 to 29.9 30 to 34.9 > 40 Prevalence Ratio (%) Type 2 Diabetes 2.03 4.93 10.10 10.65 Coronary Heart Disease 8.84 9.60 16.01 13.97 High Blood Pressure 23.47 34.16 48.95 64.53 Osteoarthritis 2.59 4.55 4.66 10.04 Source: NHANES I I, 1988 - 1994. Table 2. Prevalence of Medical Conditions by Body Mass Index (BMI) for Women Medical Condition Body Mass Index 18.5 to 24.9 25 to 29.9 30 to 34.9 > 40 Prevalence Ratio (%) Type 2 Diabetes 2.38 7.12 7.24 19.89 Coronary Heart Disease 6.87 11.13 12.56 19.22 High Blood Pressure 23.26 38.77 47.95 63.16 Osteoarthritis 5.22 8.51 9.94 17.19 Source: NHANES I I, 1988 - 1994.
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This note was uploaded on 11/26/2010 for the course IB 35AC taught by Professor Hlusko during the Spring '08 term at Berkeley.

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class_15_2010_notes - IB35 Human Biological Variation Class...

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