June 24, 2007

County of Los AngelesPublic Health Department

Nutrition Program

Christopher J. Jarosz, Ph.D.

Supplement: Parallels to California’s AgriculturalCommunities

Representations of the Childhood Overweight Problem in Los Angeles County

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Background

• Agricultural regions of California have some of the highest rates of overweight children:

– Of the 24 cities with the highest overweight patterns, 83 percent are either in Los Angeles County or in agricultural areas

– Of the 24 cities with the lowest overweight patterns (<=15 percent), 21 percent are either in Los Angeles County or agricultural areas

– Only two agricultural communities (Davis and Chico) are among the 24 cities with the lowest overweight patterns. They also have large public universities (UC Davis and CSU Chico)

• High childhood overweight rates have been found across all major agricultural regions:

– Imperial Valley – Coachella Valley– Oxnard Plain – Santa Clarita River Valley– Santa Maria Valley– Salinas Valley– San Joaquin Valley– Sacramento Valley

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Background (continued)

• What is the extent of the high childhood overweight problem in agricultural areas in California?

• What are the parallels with high childhood overweight rates in Los Angeles County?

• Are the contributing factors similar for Los Angeles County and agricultural areas?

• “Cities” and “communities” are used interchangeably in this analysis based on what seems to fit the context best.

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Childhood Overweight RatesCalifornia’s Agricultural Communities

Davis—14.3 Oroville—29.6 Brawley—34.3Chico—18.9 Galt—30.1 Sanger—34.8Clovis—22.6 Hanford—30.1 Oxnard—35.0Elk Grove—23.3 Reedley—30.1 Madera—35.1Santa Maria—24.2 Modesto—30.3 Lompoc—35.4Tracy—25.8 Fresno—30.5 El Centro—35.9Manteca—26.1 Hollister—30.6 Watsonville—36.1Oakdale—27.4 Marysville—31.0 Calexico—36.5Yuba City—27.7 Merced—31.2 Salinas—37.7Ceres—27.9 Woodland—31.2 Coachella—37.8Red Bluff—28.5 Gilroy—31.3 Selma—38.1Lodi—28.6 Stockton—31.8 Santa Paula—38.8Lemoore—29.1 Atwater—32.2 Patterson—39.3Visalia—29.1 Porterville—32.6 Los Banos—39.8Bakersfield—29.4 Arvin—32.7 Delano—40.4Rio Linda—29.4 Dinuba—34.0 Wasco—42.0Tulare—29.5 Shafter—34.2

Percentage of overweight children listed after each city name

Median of median family incomes = $40,915 (all 50 cities)Range = $24,818 to $74,051 (Arvin lowest and Davis highest)

Data Sources: Economic data from the U.S. 2000 Census, and childhood overweight data from the California Center for Public Health Advocacy, “Overweight Children in California, 2004.” http://www.publichealthadvocacy.org.

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Childhood Overweight Rates Geographic Distribution of Agricultural Communities

CalexicoEl Centro

Brawley

Coachella

Legend (quartile standing of 50 cities and CDP derived from the 2004 study):

Map is pictorial and not precisely to scale;North to the top

Red—fourth quartile, highest overweightYellow—third quartileGreen—second quartileBlue—first quartile, lowest overweight

Davis

Chico

Santa Paula

Lompoc

Elk Grove

Santa Maria

Tracy, Manteca (both green) Oakdale

Yuba City

Red Bluff

Lemoore Visalia

Bakersfield

Rio Linda

Tulare

Galt

HanfordFresno

Merced

Woodland

Gilroy

Stockton

Porterville

ArvinShafter

Oxnard

Watsonville (red), Hollister (yellow)Salinas

Patterson, Los Banos (both red)

These cities supply fruits, vegetables, grains, andnuts to the rest of California and the United States

MarysvilleOroville

Lodi

Modesto (yellow), Ceres (yellow)

Madera (red), Clovis (green)

Wasco

Sanger (red), Selma (red), Reedley (yellow), Dinuba (red)

Atwater (red)

Delano

Median of median family incomes (2000) = $40,915

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Childhood Overweight Rates Geographic Distribution of Communities, 20 percent or less

Grass Valley

Manhattan Beach (purple), Rancho Palos Verdes (blue)

Beverly Hills

Davis

Truckee

Chico

Roseville, Rocklin (both blue)

Castro Valley (blue), Lafayette, Walnut Creek (both purple)San Ramon, Danville, Pleasanton (all purple)Belmont (blue), Palo Alto, Los Altos

(both purple) Cupertino, Saratoga, Los Gatos (all purple)

San Luis Obispo

Tehachapi

Agoura Hills, Calabasas (both purple)

Claremont, Diamond Bar (both blue)Thousand Oaks, Simi Valley (both blue)

Map is pictorial and not precisely to scale;North to the top

Blue—next 28 cities and CDPs

Yucaipa (not in correct position)La Canada Flintridge (blue), South Pasadena (purple)

Brea, Placentia, Yorba Linda (all blue)Menifee, Temecula (both blue)

PowaySan Clemente, Carlsbad (both blue), Encinitas (purple)

Lake Forest, Mission Viejo (both blue), Aliso Viejo, Laguna Niguel, and Rancho Santa Margarita (all purple)

Los Alamitos, Huntington Beach, Newport Beach (all blue), Irvine (purple)

Granite Bay (purple), Folsom (blue), El Dorado Hills (purple)Grass Valley

Median of median family incomes (2000) = $83,794

Purple—top 25 cities and CDPs

Legend (consisting of 53 cities and CDPs from the 2004 study):

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• Many of California’s agricultural communities have high childhood overweight rates including some of the highest in the state.

• The median of median family incomes is 105 percent higher in the 53 cities with the lowest childhood overweight rates than the 50 agricultural cities included in the 2004 study (Davis and Chico are listed in both categories).

• Very little geographical overlap exists between the two sets of cities except in the Sacramento Valley; however, several cities with low childhood overweight rates are in the transition zone (low foothills) between the Sacramento Valley and the Sierra Nevada.

• The patterns provide further support to the already demonstrated negative association between median family income and childhood overweight rates in Los Angeles County, suggesting an association that is generalized across the state.

• Visual inspection of the distribution of agricultural cities indicates the southern portion of California is substantially more “red” and “yellow” than the northern portion.

Childhood Overweight Rates Analysis

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Childhood Overweight Rates Comparison of Different Communities (continued)

• The table contains median family income and childhood overweight data as contained in the two presentations.

• A negative association is again evident between median family income and childhood overweight rates.

• The categories are not mutually exclusive, and the results are not amenable to regression analysis.

• The “all cities, entire state” median family income does not exactly match statewide economic figures since they include only 295 of the state’s cities from the 2004 childhood overweight study (including a few census designated places).

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Childhood Overweight Rates Comparison of City and Community Groupings

Grouping NumberMedian of

Median Family Income

Median Percent

Overweight

Agricultural communities, southern half of state 29 $36,935 34.3

Agricultural communities, entire state 50 $40,915 31.1

Agricultural communities, northern half of state 21 $45,272 29.4

Cities of Los Angeles County 63 $49,867 29.6

All cities, entire state 295 $54,472 27.0

All cities excluding agricultural communities, entire state 245 $58,788 25.8

Cities with childhood overweight rates (<= 20 percent) 53 $83,794 16.2

Cities with childhood overweight rates (<= 15 percent) 24 $102,704 13.0

Groupings are not mutually exclusive

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Summary and Conclusions

• California’s agricultural communities, and particularly those in the southern half of California, have high-to-very-high childhood overweight rates (up to 42 percent).

• Median family income in these communities is generally well below the state median, and is lowest in the southern section including the San Joaquin and Imperial Valleys.

• In both median family income and childhood overweight rates the agricultural communities are similar to a number of communities in Los Angeles County.

• Two exceptions are Davis and Chico, which have large public universities.• Almost all of the other exceptions might be linked to their recent growth as

bedroom communities for the San Francisco Bay Area (Manteca and Tracy) and Sacramento (Elk Grove).

• Other than these exceptions agricultural areas are hardly represented among the communities with the lowest childhood overweight rates in California.

• Los Angeles County, in comparison, has several communities with very low rates of childhood overweight, and in every instance they have high median family incomes.

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Summary and Conclusions(continued)

• Why would the communities that supply fresh agricultural products to the rest of California and United States have such a childhood overweight problem?

• The compelling conclusion is that, once again, socioeconomic status has a profound influence on the childhood overweight problem and the availability of, and access, to healthy foods.

• Informal observation suggest that the built environments in many agricultural communities are similar to those in many other communities including in Los Angeles County.

• Many restaurant and eating chains exist in agricultural communities, but few full-line supermarkets are available despite an overabundance of agricultural goods grown locally.

• Public parks and community open spaces can also be at a minimum, and public transportation is often limited for accessing these areas and sources of good nutrition.

• These problems are similar to those in Los Angeles County, and may require local and statewide thinking on solutions for establishing healthy communities across the socioeconomic spectrum.