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However, it remains unclear to what extent digital traces reflect real food consumption. The present study aims to bridge this gap by quantifying the link between dietary behaviors as captured via social media (Twitter) v.s. a food-tracking application (MyFoodRepo). We focus on the case of Switzerland and contrast images of foods collected through the two platforms, by designing and deploying a novel crowdsourcing framework for estimating biases with respect to nutritional properties and appearance. We find that the food type distributions in social media v.s. food tracking diverge; e.g., bread is 2.5 times more frequent among consumed and tracked foods than on Twitter, whereas cake is 12 times more frequent on Twitter. Controlling for the different food type distributions, we contrast consumed and tracked foods of a given type with foods shared on Twitter. Across food types, food posted on Twitter is perceived as tastier, more caloric, less healthy, less likely to have been consumed at home, more complex, and larger-portioned, compared to consumed and tracked foods. The fact that there is a divergence between food consumption as measured via the two platforms implies that at least one of the two is not a faithful representation of the true food consumption in the general Swiss population. Thus, researchers should be attentive and aim to establish evidence of validity before using digital traces as a proxy for the true food consumption of a general population. We conclude by discussing the potential sources of these biases and their implications, outlining pitfalls and threats to validity, and proposing actionable ways for overcoming them.<\/jats:p>","DOI":"10.1145\/3555660","type":"journal-article","created":{"date-parts":[[2022,11,11]],"date-time":"2022-11-11T22:58:54Z","timestamp":1668207534000},"page":"1-27","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":4,"title":["Biased Bytes: On the Validity of Estimating Food Consumption from Digital Traces"],"prefix":"10.1145","volume":"6","author":[{"given":"Kristina","family":"Gligoric","sequence":"first","affiliation":[{"name":"EPFL, Lausanne, Switzerland"}]},{"given":"Irena","family":"\u00d0ordevic","sequence":"additional","affiliation":[{"name":"University of Nis, Nis, Serbia"}]},{"given":"Robert","family":"West","sequence":"additional","affiliation":[{"name":"EPFL, Lausanne, Switzerland"}]}],"member":"320","published-online":{"date-parts":[[2022,11,11]]},"reference":[{"key":"e_1_2_1_1_1","doi-asserted-by":"publisher","DOI":"10.1145\/3209542.3209575"},{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1145\/2702123.2702153"},{"key":"e_1_2_1_3_1","unstructured":"Palakorn Achananuparp and Ingmar Weber. 2016. 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