There is a growing trend towards consumption of meat alternatives. In response to rising demand, many brands add meat alternative options to their offerings (e.g., Impossible Whopper from Burger King, McPlant from McDonald’s). Consistent with this trend, a growing literature explores how to encourage consumers to reduce meat consumption and increase acceptance of meat alternatives. However, there are two major limitations in literature. First, most studies in this area do not employ real behavioral outcomes as the focal dependent variable. As a result, we cannot be certain that such findings can be extrapolated into real-world settings. Second, the majority of studies have focused on cognitive factors in investigating acceptance of meat alternatives. Hence, there is a need to attend more to affective factors when investigating how we can advertise meat alternatives. Against this backdrop, the present research investigates the interactive effect between regulatory mode (a motivational factor) and positive emotion (an affective factor) for driving social media engagement in advertising meat alternatives. Regulatory mode theory posits that consumers engage in goal pursuit by adopting locomotion (a motivation to “just do it”) and assessment orientations (a motivation to “do the right thing”). We propose that different, discrete positive emotions could interact with regulatory mode to create “fit” effects. Specifically, the fit between assessment orientation and the emotion of awe, and between locomotion orientation and the emotion of love will lead to increased social media engagement.