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Getting heavier, younger: trajectories of obesity over the life course.

Lee JM, Pilli S, Gebremariam A, Keirns CC, Davis MM, Vijan S, Freed GL, Herman WH, Gurney JG - Int J Obes (Lond) (2009)

Bottom Line: Such trends may have implications for the prevalence of obesity-associated conditions among population subgroups, including type 2 diabetes.Trends are particularly pronounced for female compared with male, and black compared with white cohorts.The increasing cumulative exposure to excess weight over the lifetime of recent birth cohorts will likely have profound implications for future rates of type 2 diabetes, and mortality within the US population.

View Article: PubMed Central - PubMed

Affiliation: Division of Pediatric Endocrinology, University of Michigan, Ann Arbor, MI 48109-5456, USA. joyclee@umich.edu

ABSTRACT

Context: Although recent trends in obesity have been well documented, generational patterns of obesity from early childhood through adulthood across birth cohorts, which account for the recent epidemic of childhood obesity, have not been well described. Such trends may have implications for the prevalence of obesity-associated conditions among population subgroups, including type 2 diabetes.

Objective: Our objective was to evaluate trajectories of obesity over the life course for the US population, overall and by gender and race.

Design, setting and participants: We conducted an age, period and birth cohort analysis of obesity for US individuals who participated in the National Health and Nutrition Examination Surveys (NHANES) (1971-2006).

Main outcome measures: Obesity was defined as a body mass index >or=95th percentile for individuals aged 2-16 years or >or=30 kg m(-2) among individuals older than 16 years. Age was represented by the age of the individual at each NHANES, period was defined by the year midpoint of each survey, and cohort was calculated by subtracting age from period.

Results: Recent birth cohorts are becoming obese in greater proportions for a given age, and are experiencing a greater duration of obesity over their lifetime. For example, although the 1966-1975 and 1976-1985 birth cohorts had reached an estimated obesity prevalence of at least 20% by 20-29 years of age, this level was only reached by 30-39 years for the 1946-1955 and 1956-1965 birth cohorts, by 40-49 years for the 1936-1945 birth cohort and by 50-59 years of age for the 1926-1935 birth cohort. Trends are particularly pronounced for female compared with male, and black compared with white cohorts.

Conclusions: The increasing cumulative exposure to excess weight over the lifetime of recent birth cohorts will likely have profound implications for future rates of type 2 diabetes, and mortality within the US population.

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Related in: MedlinePlus

6a Age trends in obesity prevalence by birth cohort for whites (1971-2006)6b Age trends in obesity prevalence by birth cohort for blacks (1971-2006)
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Figure 6: 6a Age trends in obesity prevalence by birth cohort for whites (1971-2006)6b Age trends in obesity prevalence by birth cohort for blacks (1971-2006)

Mentions: We found differences in age trends by birth cohort by gender (figures 5a and 5b) and race (figures 6a and 6b). Absolute obesity prevalences were higher for female cohorts compared with male cohorts, and for black cohorts compared with white cohorts. We also found gender and race differences with regard to the attenuation of obesity trends leading to the last decade of life. The slopes of the final lines leading to the last decade of life for each cohort were notably lower for females compared with males, and for whites compared with blacks. For example, the absolute percentage increase in obesity across cohorts was 4% for females vs. 7% for males, and 6% for whites vs. 10% for blacks.


Getting heavier, younger: trajectories of obesity over the life course.

Lee JM, Pilli S, Gebremariam A, Keirns CC, Davis MM, Vijan S, Freed GL, Herman WH, Gurney JG - Int J Obes (Lond) (2009)

6a Age trends in obesity prevalence by birth cohort for whites (1971-2006)6b Age trends in obesity prevalence by birth cohort for blacks (1971-2006)
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2926791&req=5

Figure 6: 6a Age trends in obesity prevalence by birth cohort for whites (1971-2006)6b Age trends in obesity prevalence by birth cohort for blacks (1971-2006)
Mentions: We found differences in age trends by birth cohort by gender (figures 5a and 5b) and race (figures 6a and 6b). Absolute obesity prevalences were higher for female cohorts compared with male cohorts, and for black cohorts compared with white cohorts. We also found gender and race differences with regard to the attenuation of obesity trends leading to the last decade of life. The slopes of the final lines leading to the last decade of life for each cohort were notably lower for females compared with males, and for whites compared with blacks. For example, the absolute percentage increase in obesity across cohorts was 4% for females vs. 7% for males, and 6% for whites vs. 10% for blacks.

Bottom Line: Such trends may have implications for the prevalence of obesity-associated conditions among population subgroups, including type 2 diabetes.Trends are particularly pronounced for female compared with male, and black compared with white cohorts.The increasing cumulative exposure to excess weight over the lifetime of recent birth cohorts will likely have profound implications for future rates of type 2 diabetes, and mortality within the US population.

View Article: PubMed Central - PubMed

Affiliation: Division of Pediatric Endocrinology, University of Michigan, Ann Arbor, MI 48109-5456, USA. joyclee@umich.edu

ABSTRACT

Context: Although recent trends in obesity have been well documented, generational patterns of obesity from early childhood through adulthood across birth cohorts, which account for the recent epidemic of childhood obesity, have not been well described. Such trends may have implications for the prevalence of obesity-associated conditions among population subgroups, including type 2 diabetes.

Objective: Our objective was to evaluate trajectories of obesity over the life course for the US population, overall and by gender and race.

Design, setting and participants: We conducted an age, period and birth cohort analysis of obesity for US individuals who participated in the National Health and Nutrition Examination Surveys (NHANES) (1971-2006).

Main outcome measures: Obesity was defined as a body mass index >or=95th percentile for individuals aged 2-16 years or >or=30 kg m(-2) among individuals older than 16 years. Age was represented by the age of the individual at each NHANES, period was defined by the year midpoint of each survey, and cohort was calculated by subtracting age from period.

Results: Recent birth cohorts are becoming obese in greater proportions for a given age, and are experiencing a greater duration of obesity over their lifetime. For example, although the 1966-1975 and 1976-1985 birth cohorts had reached an estimated obesity prevalence of at least 20% by 20-29 years of age, this level was only reached by 30-39 years for the 1946-1955 and 1956-1965 birth cohorts, by 40-49 years for the 1936-1945 birth cohort and by 50-59 years of age for the 1926-1935 birth cohort. Trends are particularly pronounced for female compared with male, and black compared with white cohorts.

Conclusions: The increasing cumulative exposure to excess weight over the lifetime of recent birth cohorts will likely have profound implications for future rates of type 2 diabetes, and mortality within the US population.

Show MeSH
Related in: MedlinePlus