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Windows of Opportunity

Windows of Opportunity. Obesity Prevention in Childhood Alan M. Lake, M.D. Taskforce on Obesity Prevention in Childhood Maryland Chapter, American Academy of Pediatrics. Prevention vs. Treatment Why Prevention?. Appeal, indeed mantra, in Pediatrics

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Windows of Opportunity

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  1. Windows of Opportunity Obesity Prevention in Childhood Alan M. Lake, M.D. Taskforce on Obesity Prevention in Childhood Maryland Chapter, American Academy of Pediatrics

  2. Prevention vs. Treatment Why Prevention? • Appeal, indeed mantra, in Pediatrics • Opportunities begin in-utero or before • Greatest and Quickest impact • Low risk • Poor ability to recognize increased risk in time to make a difference

  3. Why bother? • David Katz: Yale “ Today’s kids may become the first generation in the history of man to have a life expectancy projected to be less than that of their parents.”

  4. Definition of Obesity • 0 -2 years: Wt/Ht > 95%ile • 2 – 18 years: BMI > 95%ile • At Risk: BMI 85 – 95%ile • Adult Overweight: BMI > 25 – 30 • Obesity Class 1: BMI 30 – 34.9 (30#) • Obesity Class 2: BMI 35 – 39.9 (50#) • Obesity Class 3: BMI > 40 (100#)

  5. Physiology of Fat • Excess energy intake relative to energy consumed • Excess 3500 kcal yields one pound of fat • Excess 50 kcal a day yields 5# fat gain in one year.

  6. Where we are nowChildhood Obesity: Past 40 Years Percent with BMI > 95%ile AGE 6 – 11 12 - 19 • 1963 – 1970 4 % 5 % • 1971 – 1974 4 6 • 1976 – 1980 7 5 • 1988 – 1994 11 11 • 1999 – 2000 15 15

  7. Teen Obesity YRBS survey: 2005 • 28.8% have BMI above the 85%ile • “at risk or already obese” • Hospital Costs for Obesity Related complications: • 1979 – 1981 $35 million/year • 1997 – 1999 $127 million/year

  8. Where we are nowMaryland WIC age 2 – 5 June, 2006 Total Children 33,154 BMI: < 5%ile 3% BMI: 5 – 85%ile 64% BMI: 85 – 95%ile 17% BMI: > 95%ile 16% ( one in three at risk or obese)

  9. Where we are nowAdult Obesity Increase % With BMI > 35 (Class 2) • Age1991 1998 %Inc • 18 – 29 7.1 % 12.1% 69.9 • 30 – 39 11.3 16.9 49.5 • 40 – 49 15.8 21.2 34.3 • 50 – 59 16.1 23.8 47.9 • 60 – 69 14.7 21.3 44.9 • > 70 11.4 14.6 28.6

  10. Distribution of Adult Obesity: 2004 • Adult Females: 57% have BMI> 25 • Adult Males: • BMI > 25 67% • BMI > 30 32% • BMI > 40 8% • Represents a 350% increase in 15 yrs

  11. Adult Obesity Prevention Strategies: Surgeon General • Increase Physical activity to 30 – 60 minutes a day • Reduce portion sizes of meals • Reduce soda, fruit drinks, and desserts • Eat 5 – 9 servings of fruits and vegetables a day. • Reduce t.v. and video time to no more than one hour a day

  12. Relevance of Early Obesity • If >95% wt/ht at one year, 3 fold greater risk of >95% BMI at 3 years • If > 95%ile BMI at 3 – 6 years, 50% remain obese as adults • If > 99%ile at age 9, 100% risk of adult obesity and early complications of obesity • If > 95%ile BMI at 16 years, >80% remain obese as adults. • The <20% of teens who lose weight do not reduce increased cardiovascular risk

  13. Windows of Opportunity Prevention in Childhood • Prenatal and pre-prenatal • Peri-natal “catch-up growth” • Infancy, via breast feeding • Toddler self-regulation • Preschool habit intake • Elementary “wellness education” • Adolescent diet and exercise

  14. Intrauterine: “Thrift Gene” • More than 250 obesity-associated genes • We all have at least one • Only 2 lean-associated genes • 15 single gene mutations predict obesity • If one parent obese, increase risk 3 fold • If both parents obese, increase risk 13 fold • Gene marker: MC4R causes >5% of obesity • Genes set threshold of receptor response

  15. Intrauterine “Programming” Barker Hypothesis • Alterations in fetal nutrition and endocrine status result in permanent developmental adaptations in structure, physiology, and metabolism thereby predisposing the fetus to cardiovascular, metabolic, and endocrine disease in adult life.

  16. Intrauterine:Proof of Barker Hypothesis • 16,000 subjects born 1911 – 1930 • For birth weights below 8#, lower the weight, the higher the risk of cardiovascular disease and mortality • Birth weights above 9#, higher the weight, greater the risk • If weight gain in first year too great or too slow, risk is increased

  17. Intrauterine: Role of caloric deprivation • Holland, World War 2 • Babies born IUGR, greatest risk of obesity, diabetes, hypertension. • Greatest risk if maternal malnutrition is in the first trimester in lower socio-economic classes. • Lower risk with caloric deprivation in last trimester when fetal body fat normally increases from 5% to 16% of body weight.

  18. Intrauterine: Other Factors • Over the past ten years, increased birth weights noted, primarily due to increased pre-pregnancy maternal wt. • Maternal smoking reduces birth weight, increases risk of adult obesity • Highest risk for early Type 2 diabetes: birth weight in lowest 30%, weight at age 8 in highest 50%.

  19. Intrauterine: Other factors • Maternal obesity and birth weight above 8# 8oz increases 5 fold the risk for subsequent leukemia in the child. • Attributed to increased IGF 1 stimulation of stem cells to predispose to leukemia.

  20. Intrauterine: Nutrigenomics • The science of interaction of nutrition and gene expression in utero • Role of “priming” of metabolic responses that persists into adulthood • Goal of optimal maternal nutrition prior to and during pregnancy

  21. Intrauterine: Options for Intervention • Reduce pre-pregnancy obesity • Address maternal diet and exercise especially in first trimester • Reduce glycemic index of intake to reduce intrauterine insulin and IGF1 levels • Establish new nutrition and weight gain goals for pregnancy

  22. The Glycemic Index • Determined by rate of glucose metabolism • Glycemic load = index x intake • High glycemic = glucose, sucrose • Lower glycemic = complex starches • High glycemic intake induces hyperglycemia at 4 – 6 hours, increases insulin, epinephrine, and thus increases appetite • In past 20 years, maternal diet stable in protein, reduced in fat, increased in carbs by 65 grams a day. Calories up 270 kcal/d

  23. Perinatal Factors • Obesity risk correlates with weight gain in first week of life • In IUGR, rapid weight gain in first year increases risk of obesity, diabetes and cardiovascular disease, especially if outpaces height gain. Need to adjust caloric intake to optimize growth not weight gain.

  24. Infancy: Opportunities • Encourage breast feeding to allow infant to self-regulate intake and increase flavor preference • Delay introduction of solid foods until after 4 – 6 months • Wean from bottle use by 18 months of age • Improve WIC wellness education

  25. Role of Breast Feeding • 8 of 11 studies of > 100 breast fed babies followed more than 3 years revealed lower rates of childhood obesity • If “ever” breast fed, reduction of 15% • Recent retrospective study at Harvard, no sustained benefit into adulthood

  26. Value of Breast feeding • Slower weight gain in first weeks • Self regulated caloric intake • Lower insulin levels in first year • Wider food preferences after 2 years of age, lower sugar, lower salt. • Reduced or delayed development of Type 2 diabetes in Pima Indians

  27. FITS study, 3000 infants Gerber and ADA • Daily caloric intake relative to estimated need • 3 day diet histories, prospective, at 3 month intervals • Age Est NeedActual Intake%excess • 4 – 6 mo 629 690 +10% • 7 – 11 mo 739 924 +23% • 1 – 2 yrs 950 1249 +31% • 27% of infants in WIC, at 11 mos +32%, at 2 years, + 40%

  28. FITS data on solid foods • 29% of infants fed solids before 4 mo • By age 2, 30% ate no fruit, 20% no veges in the three days documented • By age 2, 37% drinking juice daily, 27% eating potato chips daily

  29. Role of extended bottles • 20% of 2 year olds, 10% of 3 year olds, 2.5% of 4 year olds use bottle daily. • From NHANES III data, for every month past 18 months, that a child uses a bottle, there is a 3% increase in risk of having BMI > 95%ile at 10.

  30. Toddler: Self regulation • From 18 months to 3 – 4 years, a toddler will self regulate their intake. If food of higher caloric density is served, they eat less. If food of reduced caloric density is served, they eat more. • Parent chooses food to offer, child regulates intake

  31. Toddler: Food choices • A toddler, on average, must be offered a new food 10 – 12 times before they will eat it. Most parents offer it no more than 3 times and give up. • Do not mix new food with existing preferred food, the toddler will stop eating both.

  32. Toddler activity • 75% of 3 year olds still in strollers, with 39% of 4 year olds still in strollers while “at the park” • If a toddler is bored and fussy, take them out to play, do not turn on a video. • Minimize video or screen time

  33. Preschool Opportunities • Community access to improve wellness education and role modeling through Head Start and licensed day care programs • Preschool children at play devote only 11% of free time to moderate exercise

  34. Routine BMI Screening • American Academy of Pediatrics and American Academy of Family Practice favor screening all children • U.S.P.S.T.F.: Evidence insufficient to recommend for or against. • Bill Dietz: You can’t have evidence-based practice until you have practice-based evidence. Screen on!!!!!

  35. The Adiposity “Rebound” The nadir of the BMI • Normal BMI declines at 2 years to nadir at 3 to 5 years, then climbs through puberty (and beyond) • If child enters high on the curve or rebound begins early, greater risk of adult obesity and Type 2 diabetes • Occurs in transition from “self-regulated” intake to “habit intake”

  36. Physiology of the Adiposity Rebound • From age 1 to 3 years, child’s length increases and fat cell size declines with a stable number of fat cells • From age 4 to 6 years, there is an increase of fat cell number and size that may be predictive of future obesity

  37. The “window” in preschool • Community access via existing programs • First real value for role models • Sustain self-regulated intake • Establish habit of daily exercise, 60 to 90 minutes a day, half unstructured • Enter adiposity rebound on the lower end

  38. Elementary School • Diet influenced by media and parent role model • Average USA child spends 75% of waking time inactive, 12 minutes a day in vigorous activity • In average elementary school gym class, child is active for only 3 minutes

  39. Elementary School • Obesity risk can be reduced by 10% for every hour less watching television • Obesity risk can be reduced by 10% for every hour more in moderate exercise • By age 5 – 10 years, 50% of obese children have a positive risk factor for early cardiovascular disease

  40. Elementary School • Physical education goal of 30 min/day or 150 min/wk with 50% of time in moderate to vigorous activity • Only one county in Maryland provides this time • Providing time for physical activity does not lead to reduced school performance or test results in NCLB

  41. The “window” in elementary school • Reduce screen time to less than 2 hours a day • Reducing t.v. time alone of no value • Increase physical activity to 30 – 60 minutes a day • Establish wellness agenda of improved nutrition and physical activity • Family and School-based role models

  42. Secondary School Concerns • 30% of obese teens have 2 or more features of metabolic syndrome present • High LDL-C at age 15 – 18 years associated with 5 fold increase in adult obesity, hyperlipidemia, and hypertension

  43. Secondary School Concerns • 30% of teens and 40% of adults eat fast food on a daily basis. Fast food adds 187 kcal/day to intake. (22#/yr) • Average teen consumes 870 cans of soft drink a year. • Only 65% of teens have any vigorous activity more than 3 days a week and only 27% more than 5 days a week

  44. Secondary School Physical Activity • Daily gym class: 6.4% of middle schools, 5.8% of high schools in U.S. • Only 17% of students walk to school • Every half mile walked by teen reduces obesity risk by 5% • Girls age 9 to 19, 83% decline in habitual physical activity

  45. The “window” for teens • Increase responsibility for food choices and food preparation • Healthy breakfast, 3 balanced meals • Avoid after school “chicken box” • Support exercise, dance, and family activities in evenings and weekends • Support school phys ed 225 min/wk

  46. Office Monitoring for Complications • Determine and plot BMI %ile and share with student and family • Discuss pace of change, not blame • Document blood pressure and waist circumference • Lab screening if >85%ile to document status and risk

  47. Lab screening • Urine analysis for glucose and protein • Fasting lipid profile • Chemistry profile, Vitamin B-12 • Fasting glucose, insulin, HgbA1C • Androgen levels if concern for PCOS • Hepatic sonogram for steatohepatosis

  48. Psychological Screening • Monitor school performance • Discuss bullying • Reduced self-esteem/depression • 34% of teens with BMI >95%ile are depressed • 8% of teens with normal BMI %ile

  49. Treatment in Childhood • Age 2 – 7 years, emphasis on maintaining weight unless established complication • Age 7 – 18, weight loss if >95%ile or >85%ile with complication • Seek goal of 1 pound loss a month. • Combined diet and exercise program

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