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A systematic review of the effectiveness of taxes on nonalcoholic beverages and high-in-fat foods as a means to prevent obesity trends

Authors Maniadakis N, Kapaki V, Damianidi L, Kourlaba G

Received 9 June 2013

Accepted for publication 5 August 2013

Published 22 October 2013 Volume 2013:5 Pages 519—543


Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 5

Nikolaos Maniadakis,1 Vasiliki Kapaki,1,2 Louiza Damianidi,3Georgia Kourlaba4
1Department of Health Services Organization and Management, National School of Public Health, Athens, 2University of Peloponnese, Peloponnese, 3Department of Allergy, Second Pediatric Clinic, National and Kapodistrian University of Athens School of Medicine, Athens, 4The Stavros Niarchos Foundation – Collaborative Center for Clinical Epidemiology and Outcomes Research (CLEO), First and Second Departments of Pediatrics, National and Kapodistrian University of Athens School of Medicine, Athens, Greece

Background: As part of the efforts to curb obesity, a new focus seems to be put on taxing foods that are perceived as being associated with obesity (eg, sugar-sweetened beverages and foods high in fat, sugar, and salt content) as a policy instrument to promote healthier diets.
Objective: To assess the possible effects of such taxation policies by identifying and analyzing all studies which investigate the impact of price increases on consumption, caloric intake, or weight outcomes.
Methods: Electronic data bases were searched with appropriate terms and their combinations. Thereafter, abstracts were reviewed and studies were selected based on predefined criteria. The characteristics of the selected studies and the results were extracted in a special form and consequently were reviewed and synthesized.
Results: Price increase may lead to a reduction in consumption of the targeted products, but the subsequent effect on caloric intake may be much smaller. Only a limited number of the identified studies reported weight outcomes, most of which are either insignificant or very small in magnitude to make any improvement in public health.
Conclusion: The effectiveness of a taxation policy to curb obesity is doubtful and available evidence in most studies is not very straightforward due to the multiple complexities in consumer behavior and the underling substitution effects. There is need to investigate in-depth the potential underlying mechanisms and the relationship between price-increase policies, obesity, and public health outcomes.
Keywords: price, fat tax, sugar-sweetened beverages, calorie(s), elasticity, weight, body mass index

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