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Beverage purchases from stores in Mexico under the excise tax on sugar sweetened beverages: observational study.
BMJ. 2016 Jan 06; 352:h6704.BMJ

Abstract

STUDY QUESTION

What has been the effect on purchases of beverages from stores in Mexico one year after implementation of the excise tax on sugar sweetened beverages?

METHODS

In this observational study the authors used data on the purchase of beverages in Mexico from January 2012 to December 2014 from an unbalanced panel of 6253 households providing 205 112 observations in 53 cities with more than 50 000 inhabitants. To test whether the post-tax trend in purchases was significantly different from the pretax trend, the authors used a difference in difference fixed effects model, which adjusts for both macroeconomic variables that can affect the purchase of beverages over time, and pre-existing trends. The variables used in the analysis included demographic information on household composition (age and sex of household members) and socioeconomic status (low, middle, and high). The authors compared the predicted volumes (mL/capita/day) of taxed and untaxed beverages purchased in 2014-the observed post-tax period-with the estimated volumes that would have been purchased if the tax had not been implemented (counterfactual) based on pretax trends.

STUDY ANSWER AND LIMITATIONS

Relative to the counterfactual in 2014, purchases of taxed beverages decreased by an average of 6% (-12 mL/capita/day), and decreased at an increasing rate up to a 12% decline by December 2014. All three socioeconomic groups reduced purchases of taxed beverages, but reductions were higher among the households of low socioeconomic status, averaging a 9% decline during 2014, and up to a 17% decrease by December 2014 compared with pretax trends. Purchases of untaxed beverages were 4% (36 mL/capita/day) higher than the counterfactual, mainly driven by an increase in purchases of bottled plain water.

WHAT THIS STUDY ADDS

The tax on sugar sweetened beverages was associated with reductions in purchases of taxed beverages and increases in purchases of untaxed beverages. Continued monitoring is needed to understand purchases longer term, potential substitutions, and health implications.

FUNDING, COMPETING INTERESTS, DATA SHARING

This work was supported by grants from Bloomberg Philanthropies and the Robert Wood Johnson Foundation and by the Instituto Nacional de Salud Pública and the Carolina Population Center. The authors have no competing interests. No additional data are available.

Authors+Show Affiliations

Center for Health Systems Research, Instituto Nacional de Salud Pública, Universidad No 655 Colonia Santa María Ahuacatitlán, Cuernavaca, Morelos, Mexico.Department of Nutrition and Carolina Population Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27516, USA.Nutrition and Health Research Center, Instituto Nacional de Salud Pública, Mexico.Department of Nutrition and Carolina Population Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27516, USA shuwen@unc.edu.

Pub Type(s)

Journal Article
Observational Study
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

26738745

Citation

Colchero, M Arantxa, et al. "Beverage Purchases From Stores in Mexico Under the Excise Tax On Sugar Sweetened Beverages: Observational Study." BMJ (Clinical Research Ed.), vol. 352, 2016, pp. h6704.
Colchero MA, Popkin BM, Rivera JA, et al. Beverage purchases from stores in Mexico under the excise tax on sugar sweetened beverages: observational study. BMJ. 2016;352:h6704.
Colchero, M. A., Popkin, B. M., Rivera, J. A., & Ng, S. W. (2016). Beverage purchases from stores in Mexico under the excise tax on sugar sweetened beverages: observational study. BMJ (Clinical Research Ed.), 352, h6704. https://doi.org/10.1136/bmj.h6704
Colchero MA, et al. Beverage Purchases From Stores in Mexico Under the Excise Tax On Sugar Sweetened Beverages: Observational Study. BMJ. 2016 Jan 6;352:h6704. PubMed PMID: 26738745.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Beverage purchases from stores in Mexico under the excise tax on sugar sweetened beverages: observational study. AU - Colchero,M Arantxa, AU - Popkin,Barry M, AU - Rivera,Juan A, AU - Ng,Shu Wen, Y1 - 2016/01/06/ PY - 2016/1/8/entrez PY - 2016/1/8/pubmed PY - 2016/5/3/medline SP - h6704 EP - h6704 JF - BMJ (Clinical research ed.) JO - BMJ VL - 352 N2 - STUDY QUESTION: What has been the effect on purchases of beverages from stores in Mexico one year after implementation of the excise tax on sugar sweetened beverages? METHODS: In this observational study the authors used data on the purchase of beverages in Mexico from January 2012 to December 2014 from an unbalanced panel of 6253 households providing 205 112 observations in 53 cities with more than 50 000 inhabitants. To test whether the post-tax trend in purchases was significantly different from the pretax trend, the authors used a difference in difference fixed effects model, which adjusts for both macroeconomic variables that can affect the purchase of beverages over time, and pre-existing trends. The variables used in the analysis included demographic information on household composition (age and sex of household members) and socioeconomic status (low, middle, and high). The authors compared the predicted volumes (mL/capita/day) of taxed and untaxed beverages purchased in 2014-the observed post-tax period-with the estimated volumes that would have been purchased if the tax had not been implemented (counterfactual) based on pretax trends. STUDY ANSWER AND LIMITATIONS: Relative to the counterfactual in 2014, purchases of taxed beverages decreased by an average of 6% (-12 mL/capita/day), and decreased at an increasing rate up to a 12% decline by December 2014. All three socioeconomic groups reduced purchases of taxed beverages, but reductions were higher among the households of low socioeconomic status, averaging a 9% decline during 2014, and up to a 17% decrease by December 2014 compared with pretax trends. Purchases of untaxed beverages were 4% (36 mL/capita/day) higher than the counterfactual, mainly driven by an increase in purchases of bottled plain water. WHAT THIS STUDY ADDS: The tax on sugar sweetened beverages was associated with reductions in purchases of taxed beverages and increases in purchases of untaxed beverages. Continued monitoring is needed to understand purchases longer term, potential substitutions, and health implications. FUNDING, COMPETING INTERESTS, DATA SHARING: This work was supported by grants from Bloomberg Philanthropies and the Robert Wood Johnson Foundation and by the Instituto Nacional de Salud Pública and the Carolina Population Center. The authors have no competing interests. No additional data are available. SN - 1756-1833 UR - https://www.unboundmedicine.com/medline/citation/26738745/Beverage_purchases_from_stores_in_Mexico_under_the_excise_tax_on_sugar_sweetened_beverages:_observational_study_ L2 - https://www.bmj.com/lookup/pmidlookup?view=long&pmid=26738745 DB - PRIME DP - Unbound Medicine ER -