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Cross-sectional association of Toxoplasma gondii exposure with BMI and diet in US adults

Cuffey, J, Lepczyk, CA, Zhao, S and Fountain-Jones, NM ORCID: 0000-0001-9248-8493 2021 , 'Cross-sectional association of Toxoplasma gondii exposure with BMI and diet in US adults' , PLoS Neglected Tropical Diseases, vol. 15, no. 10 , pp. 1-19 , doi:

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Toxoplasmosis gondii exposure has been linked to increased impulsivity and risky behaviors, which has implications for eating behavior. Impulsivity and risk tolerance is known to be related with worse diets and a higher chance of obesity. There is little known, however, about the independent link between Toxoplasma gondii (T. gondii) exposure and diet-related outcomes. Using linear and quantile regression, we estimated the relationship between T. gondii exposure and BMI, total energy intake (kcal), and diet quality as measured by the Health Eating Index-2015 (HEI) among 9,853 adults from the 20092014 National Health and Nutrition Examination Survey. Previous studies have shown different behavioral responses to T. gondii infection among males and females, and socioeconomic factors are also likely to be important as both T. gondii and poor diet are more prevalent among U.S. populations in poverty. We therefore measured the associations between T. gondii and diet-related outcomes separately for men and women and for respondents in poverty. Among females Toxoplasmosis gondii exposure was associated with a higher BMI by 2.0 units (95% CI [0.22, 3.83]) at median BMI and a lower HEI by 5.05 units (95% CI [-7.87, -2.24]) at the 25th percentile of HEI. Stronger associations were found at higher levels of BMI and worse diet quality among females. No associations were found among males. Through a detailed investigation of mechanisms, we were able to rule out T. gondii exposure from cat ownership, differing amounts of meat, and drinking water source as potential confounding factors; environmental exposure to T. gondii as well as changes in human behavior due to parasitic infection remain primary mechanisms.

Item Type: Article
Authors/Creators:Cuffey, J and Lepczyk, CA and Zhao, S and Fountain-Jones, NM
Journal or Publication Title: PLoS Neglected Tropical Diseases
Publisher: Public Library of Science
ISSN: 1935-2727
DOI / ID Number:
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© 2021 Cuffey et al. This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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