Figure 1.

Daily energy intake of US adults by food source, 1965-1966 to 2007-2008. Data sources: Household Food Consumption Survey (HFCS) of 1965–1966 (n=4,114), Nationwide Food Consumption Survey (NFCS) of 1977–1978 (n=12,935), Continuing Survey of Food Intakes by Individuals (CSFII) of 1989–1991 (n=7,750), CSFII of 1994–1996 (n=6,894), National Health and Nutrition Examination Survey (NHANES) of 2003–2004 (n=3,138), and NHANES of 2007–2008 (n=3,734). * Percentage of calories eaten from home sources differed significantly from HFCS 1965–1966, p ≤ 0.01 (t-test). ** Percentage of calories eaten from home sources differed significantly from previous survey, p ≤ 0.01 (t-test). *** Percentage of calories eaten from home sources differed significantly between low and high income groups for relevant survey year, p ≤ 0.01 (t-test).

Smith et al. Nutrition Journal 2013 12:45   doi:10.1186/1475-2891-12-45
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