The purpose of this study was to investigate influences, motives and adherence factors explaining why men choose and adhere to a meatless (vegan, vegetarian or pescetarian) diet. An online survey was distributed through social media, yielding 544 international respondents with information on sociodemographics, values, main barriers, motivation and influence towards meatless lifestyle choice. An open question gathered qualitative data on how participants overcame perceived barriers to meatless eating. The larger influencer was scientific research (19.1%) and as their main motive animal welfare (49.1%). Reported adherence factors were related to people (as family, friends, partners, community), research and recipes. Age, dietary lifestyle (vegetarian, pescatarian) are positive predictors of adherence. Living in EU, skills and hardship barriers and own perception of barriers are negatively associated to long term adherence to a meatless diet. Feeling supported by other people plays a key role in adhering to the diet over time.