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RISK FACTORS FOR ATHEROSCLEROSIS IN OBESE CHILDREN

RISK FACTORS FOR ATHEROSCLEROSIS IN OBESE CHILDREN. Dyslipidemia High triglycerides, VLDL Low HDL High small, dense LDL Glucose intolerance, diabetes Hypertension. Pathobiological Determinants of Atherosclerosis in Youth Study (PDAY).

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RISK FACTORS FOR ATHEROSCLEROSIS IN OBESE CHILDREN

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  1. RISK FACTORS FOR ATHEROSCLEROSIS IN OBESE CHILDREN • Dyslipidemia • High triglycerides, VLDL • Low HDL • High small, dense LDL • Glucose intolerance, diabetes • Hypertension

  2. Pathobiological Determinants of Atherosclerosis in Youth Study (PDAY) • 3000 autopsies after trauma, age 15-34y, 9 centers • 15-19y: fatty streaks in all aortas, half of coronaries • More fatty streaks and advanced plaque with • high LDL, VLDL • low HDL • high blood pressure • smoking • obesity • glucose intolerance Strong, et al. JAMA 281:727-735, 1999

  3. PDAY: Low Risk vs. High Risk Lipid Profiles McGill et al Am J Clin Nutr 72:1307S-15S, 2000

  4. Pediatric Obesity Council Protocol Title: Differences in Vascular Compliance in Pediatric Patients at Risk for Cardiovascular Disease as Measured by Endo-PAT Technology PI: Rubin Cooper, M.D., Dept. of Cardiology Subjects: age 8-18, 20 per group: 1) healthy controls 2) overweight (BMI>95%) 3) high cholesterol and/or triglycerides 4) fatty liver Study Design: at baseline, 6 and 12 months: 1) endo-PAT test 2) carotid artery wall thickness by ultrasound 3) fasting blood sample

  5. Does sugar make us fat, dyslipidemic and diabetic?

  6. Major Sources of Calories as High-fructose Corn syrup (HFCS) and Sucrose Duffey, K. J et al. Am J Clin Nutr 2008;88:1722S-1732S

  7. Nutritional Studies of: • Chronic effects of the equicaloric substitution of carbohydrate for fat • Acute effects of oral challenges with fructose

  8. Dietary Fructose: • - Does not acutely raise glucose or insulin • Raises plasma triglycerides more than glucose • Rapidly increases palmitate synthesis?

  9. AUC TG %16:0

  10. Hypothesis: In overweight subjects, the synthesis of palmitate from dietary fructose will be • greater when consumed with glucose • show a dose-response.

  11. Study Design: • Outpatient, random order, cross-over, single blinded study in 15 overweight subjects • Screening visit with 3h OGTT • (75 g glucose, mean 0.9g/kg) • Sugar in 12 oz water, 15 min: • Fructose, 0.5g/kg • Fructose:Glucose 1g/kg • Fructose:Glucose 2g/kg • Blood sampling at 0, 1, 2, 3, 4h

  12. Lessons Learned: • Theequicaloricsubstitution of fat with sugar does not increase body fat. • The equicaloric substitution of fat with sugar, fructose more than glucose, causes dyslipidemia by increasing the production of fat from sugar in the liver. • The large within-subject variability in response may be partially explained by differences in insulin sensitivity. • Dyslipidemia associated with obesity is readily corrected by modifications in diet and physical activity.

  13. Some unanswered questions: • Does the lipogenic response to sugar predict susceptibility to diabetes, fatty liver and atherosclerosis? • Are there age- and family-specific differences in sugar-induced lipogenesis? • What are optimal levels of HFCS/sucrose in the diet? • What are the best ways to evaluate extent and progression of insulin resistance and atherosclerosis?

  14. %

  15. Elliott et al AJCN 2002, 76:911

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