“…Familiarity and likeability of the source was first measured based on the Instagram profile (measured using a validated semantic differential scale, each with five items) [ 39 ]. The main outcomes were post trustworthiness [ 27 ] and post authenticity [ 31 ] assessed using validated scales, as well as perceived message appeal used in the Instagram post (measured by eight individual items on a five-point Likert scale ranging from ‘strongly disagree’ to ‘strongly agree’; affiliation, hope, humour, heroic, convenience, guilt, sorrow, fear) [ 16 ]. Participants answered questions related to their own nutrition knowledge, healthy eating behaviours, and quality of life, also assessed via statements on a five-point Likert scale [ 40 , 41 , 42 , 43 ].…”