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You are here:   Home Social Environment Prevalence of Overweight & Obese Adults
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Indicator: Prevalence of Overweight & Obese Adults

Data and Data Discussion provided by Communities Count

Figure 1: Percent of Adults Age 18+ Who Are Overweight or Obese

Figure 2: Percentage of King County Adults Who are Overweight by Region, Three-Year Average 2002-2004

Figure 3: Percentage of Adults who are Overweight by Age, Race/Ethnicity, Income and Education

Sustainability Snapshot:

Inactivity and overeating generally lead people to become overweight. A reliance on calorie-laden fast and processed foods also contribute. Daily schedules do not make time to prepare healthier meals, and portion sizes, in the home and out, have drastically increased. Being overweight or obese increases the risk of many diseases and health conditions including hypertension, Type 2 diabetes, and coronary heart disease.

Sustainability Trend:

The proportion of King County adults who are overweight and obese continues to climb. In 2006, almost one in five adults were obese and more than half were overweight. Nearly nine percent of school age children were overweight.

Data Discussion

The Indicator Defined

Percent of Adults Age 18+ Who Are Overweight or Obese, King County. Overweight is defined as having a Body Mass Index (BMI) that is greater than or equal to 25 and less than 30, and obese is a BMI of 30 or more. The BMI is the ratio of weight to height.

Data Interpretation/Evaluation

The proportion of King County adults who are overweight or obese continues to increase. (Figure 1) In 2004, 36.6% of King County adults were overweight and an additional 17.7% were obese. In 1994, 31.6% were overweight and 10.1% were obese.

In 2004 the combined proportion of King County adults who were overweight or obese was 54.4%. The same figure for Washington State is 58.3%. The national proportion was 59.2% in 2002, the most recent year of data available.

The proportion of overweight or obese adults has increased in all four regions since 1994, the first year of data available by region (data not shown). The King County 3-year average from 2002-2004 for percentage of overweight or obese was 53.5%. South Region had a significantly higher average percentage (60.8%) than the other 3 regions and was higher than the county as a whole. (Figure 2)

Obesity rates in King County increase with age until age 65. (Figure 3)

Asian/Pacific Islanders have a lower rate of being obese than all other race/ethnicity groups except whites.

Persons with a college degree are less likely to be obese than those with some college or a high school degree.

Those with incomes of $50,000 or more are less likely to be obese than those with incomes of $15,000 to $24,999 per year. While other research has shown a strong association between lower incomes and higher obesity rates, this correlation is not seen in King County. Significant differences in obesity rates by income group are not consistent over time in King County.

Local data by gender are not reported here. While national survey data that are based on physical measurement indicate that adult men are more likely to be overweight or obese than women, local survey data are based only on self-report rather than physical measurement, and result in underestimations of weight in female respondents.

Data Source and Limitations

Data on adult physical activity and weight was contributed by Communities Count (www.communitiescount.org) and are based on data from the Washington State and national Behavioral Risk Factor Surveillance System (BRFSS). The BRFSS is a random telephone interview survey of non-institutionalized adults age 18 and older that has been conducted in King County every year since 1987. The question on physical activity level (how long and how many times per week) has been included since 2001 and is asked only every other year. The question on any physical activity in the previous month is asked every year. The geographic boundaries of the four King County subregions are defined by aggregating zip codes.

For a hypothetical person who is 5’10’’ tall and weighs 165 lbs, the Body Mass Index would be calculated as: BMI = 704.5 X 165 lbs/(70 inches)2 = 23.7 (where 704.5 is a conversion constant).

The limitations of an English-only telephone survey include the following: a) people who do not have a telephone are missed, b) people who do not speak English do not participate, c) people who have less education and lower incomes tend to be underrepresented.

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