The food choices we make every day have a great impact on our environment. Particularly meat consumption significantly contributes to global climate change. Although the current situation calls for a change towards more sustainable diet, meat consumption is still rising. Previous research show that dynamic social norms, i.e. information about ongoing collective behavioral change, can promote pro- environmental behavior, even in the context of meat consumption. Through two pre- registered online experimental studies conducted on a sample of university students (Study 1, N = 227) and on a sample of adult Czech population (Study 2, N = 462), this thesis examines whether dynamic norm message regarding the changing trends in meat consumption can influence intentions to consume less meat. We did not find any direct or total effect of dynamic norms on the preference for meatless meals. Mediation analysis only revealed rather weak indirect effect of dynamic norms on the preference for meatless meals mediated by perceived dynamic norms. In Study 2, we further examined whether the effect of dynamic norm message is conditioned by strength of the dynamic norms (effect of stronger vs weaker dynamic norm) and whether the provision of dynamic norm information triggers self-defense mechanisms which rationalize...