Public and health professionals' misconceptions about the dynamics of body weight gain/loss

Tarek Abdel-Hamid, Felix Ankel, Michele Battle-Fisher, Bryan Gibson, Gilberto Gonzalez-Parra, Mohammad Jalali, Kirsikka Kaipainen, Nishan Kalupahana, Ozge Karanfil, Achla Marathe, Brian Martinson, Karma Mckelvey, Suptendra Nath Sarbadhikari, Stephen Pintauro, Patrick Poucheret, Nicolaas Pronk, Ying Qian, Edward Sazonov, Kim Van Oorschot, Akshay VenkitasubramanianPhilip Murphy

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Human body energy storage operates as a stock-and-flow system with inflow (food intake) and outflow (energy expenditure). In spite of the ubiquity of stock-and-flow structures, evidence suggests that human beings fail to understand stock accumulation and rates of change, a difficulty called the stock-flow failure. This study examines the influence of health care training and cultural background in overcoming stock-flow failure. A standardized protocol assessed lay people's and health care professionals' ability to apply stock-and-flow reasoning to infer the dynamics of weight gain/loss during the holiday season (621 subjects from seven countries). Our results indicate that both types of subjects exhibited systematic errors indicative of use of erroneous heuristics. Indeed 76% of lay subjects and 71% of health care professionals failed to understand the simple dynamic impact of energy intake and energy expenditure on body weight. Stock-flow failure was found across cultures and was not improved by professional health training. The problem of stock-flow failure as a transcultural global issue with education and policy implications is discussed.

Original languageEnglish (US)
Pages (from-to)58-74
Number of pages17
JournalSystem Dynamics Review
Volume30
Issue number1-2
DOIs
StatePublished - 2014

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