Observational studyPublic health nutrition2025
Longitudinal changes in income are associated with the healthiness and sustainability of foods purchased in Mexican households.
Observational study in Public health nutrition, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
objectiveTo estimate the within-households association between change in income over time and food purchases in a national panel of households. The need to shift towards healthy and sustainable diets is widely recognised, thus the importance of identifying the factors that influence food purchase decisions.
designLongitudinal observational study; for each of the thirty-three food items queried, we ran a conditional logistic fixed-effect regression model to evaluate the association between change in income per-capita and food purchases (yes/no) during the past week, adjusted by covariates.
settingMexican Family Life Survey.
participants6008 households that participated in the survey for at least two of the three available waves of study (2002, 2005 and 2009).
resultsWithin-households, the OR (95 % CI) of purchasing the food in the past week for an increase in 1 sd of income was 1·09 (1·02, 1·16) for rarer fruits (other than bananas, apples and oranges); 1·11 (1·04, 1·18) for beef; 1·06 (1·00, 1·13) for canned tuna/sardines; 1·09 (1·02, 1·18) for fish/shellfish; 1·08 (1·02, 1·16) for discretionary packaged products and 1·15 (1·08, 1·23) for soft drinks. There were some differences by urban/rural area or socio-economic status (SES); mainly, those with lower SES had increased odds of purchasing the food item in more cases (ten out of thirty-three food items).
conclusionsHouseholds’ income growth can have mixed effects on the healthiness and sustainability of food purchases. Public policies to improve the food environment and nutrition education are necessary to enhance the positive and counteract the negative effect of income.
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