Background. Social media provides the ideal platform to share nutrition information, for communities to connect, and for misinformation to spread. However, research exploring online networks and nutrition mis information is limited. Aim. To explore the relationships between online social networks, fad diets and mental health, to understand information dissemination, influential voices and interactions between online diet communities. Methods. This exploratory study utilised Twitter posts as data for an online social network analysis. Fad diet keywords were systematically developed and data were collected and analysed using the NodeXL metrics tool to determine key network metrics. (vertices, edges, cluster algorithms, graph-visualisation, centrality measures and text-analysis). Results. This study identified (i) vegan and keto diets as the largest networks, and zone-diet as the smallest. Brand-clusters and broadcast-messaging were the dominant network structures; (ii) 31% (n=54) of top users endorsed the corresponding diet, and 11% (n=19) had a health and/or science education; (iii) 11...

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