Purpose Obesity imposes myriad negative consequences upon society, the economy and personal well-being. This study aims to investigate the effectiveness of using political correctness (PC) in social marketing messages to persuade consumers to change their unhealthy behavior. It also explores various underlying mechanisms that drive this effect. Specifically, this research studies that messaging approach – politically correct vs politically incorrect and gain vs loss message framing – generates higher consumer intentions to change their behavior. Design/methodology/approach Four experiments were conducted with nationally representative samples to examine the effect of PC and gain vs loss message framing on consumers’ behavior changing intentions. Findings Politically correct prosocial marketing messages displayed higher persuasiveness than politically incorrect messages. Each relationship was mediated by the perceived manipulative capacity of the message and consumers’ attitudes toward the message. Message framing performed as a boundary condition for these effects. Research limitations/implications This paper sought to contribute to the literature that investigates the effectiveness of social marketing efforts. Three specific contributions related to the effects of message frames on politically correct and incorrect social marketing messages were developed. Practical implications The strategies presented in this paper benefit firms wishing to create a more prosocial approach to their business. A firm can present a prosocial message to their target market in a frame focusing on what will be gained instead of lost. Likewise, firms should welcome this type of messaging that embraces politically correct terminology instead of shying away from it. Originality/value This paper generates actionable insights for marketers and policymakers regarding how best to communicate with targeted segments about culturally- and personally sensitive topics related to obesity and weight loss. This paper also contributes to the literature that explores the effectiveness of social marketing initiatives. The findings suggest policymakers and social marketers should be cautious and, regardless of today’s sociopolitical environment, avoid falling into the temptation of developing politically incorrect and loss-framed messages.