The Supplemental Nutrition Assistance Program,Food Insecurity,Dietary Quality,and Obesity Among US Adults

Objectives. We examined whether Supplemental Nutrition Assistance Program (SNAP) participation changes associations between food insecurity, dietary quality, and weight among US adults.Methods. We analyzed adult dietary intake data (n = 8333) from the 2003 to 2010 National Health and Nutrition Examination Survey. Bivariate and multivariable methods assessed associations of SNAP participation and 4 levels of food security with diet and weight. Measures of dietary quality were the Healthy Eating Index 2010, total caloric intake, empty calories, and solid fat; weight measures were body mass index (BMI), overweight, and obesity.Results. SNAP participants with marginal food security had lower BMI (1.83 kg/m²; P < .01) and lower probability of obesity (9 percentage points; P < .05). SNAP participants with marginal (3.46 points; P < .01), low (1.98 points; P < .05), and very low (3.84 points; P < .01) food security had better diets, as illustrated by the Healthy Eating Index. Associations between SNAP participation and improved diet and weight were stronger among Whites than Blacks and Hispanics.Conclusions. Our research highlights the role of SNAP in helping individuals who are at risk for food insecurity to obtain a healthier diet and better weight status.Food insecurity, broadly defined as having limited access to adequate food,1 is associated with increased stress levels and reduced overall well-being.2 In addition, food insecurity has been shown to diminish dietary quality and affect nutritional intake and has been associated with chronic morbidity (e.g., type 2 diabetes, hypertension) and weight gain.1,3–5 In 2012, approximately 14.5% of US households (17.6 million households) experienced food insecurity, of whom 5.7% (7.0 million households) experienced very low food security (i.e., reduction in food intake).6 The Supplemental Nutrition Assistance Program (SNAP), formerly known as food stamps, is the largest government assistance program in the United States and seeks to alleviate food insecurity in US households.7 SNAP has the potential to mitigate the adverse effects of food insecurity on health outcomes not only through attenuating food insecurity but also by enhancing the dietary quality of its participants.8,9Although cross-sectional studies have found no significant differences in food insecurity levels between SNAP participants and nonparticipants,10,11 in a longitudinal study, Nord observed a 28% reduction in the odds for very low food security among households that remained on SNAP throughout the year relative to those who left before the last 30 days of the year.12 In addition, studies by Leung and Villamor13 and Webb et al.14 found that independent of food insecurity, SNAP participation is associated with the increased likelihood of obesity, and other studies have observed lower dietary quality specifically among SNAP participants.15,16 Kreider et al. used partial identification bounding methods to take into account the endogenous selection and misreporting of SNAP enrollment and found that SNAP reduced the prevalence of food insecurity, poor general health, and obesity among children.17Thus, the interrelationships among SNAP participation, food insecurity, dietary quality, and weight status warrant further investigation to inform SNAP programming, policy, and outreach to ultimately improve the health and well-being of SNAP participants. We explored these relationships in data from the National Health and Nutrition Examination Survey (NHANES) over multiple years. We aimed to determine mitigating effects SNAP participation might have on the association of food insecurity with dietary quality and obesity among a nationally representative sample of US adults.