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When it comes to health(-risk) behaviors, researchers are apt to consider how to change behaviors from a top-down approach (i.e., using the conscious, reflective, deliberate system) even though much of human behavior is determined by bottom-up processes (i.e., the nonconscious, reflexive, impulsive system). Given that researchers have proposed that interventions that target nonconscious processes underlying health(-risk) behaviors may prove to be more effective than interventions that target conscious processes, we argue that understanding the ways in which mimicking and modeling affect health(-risk) behaviors is a critical—albeit largely unexplored—domain. In this paper, we review existing evidence that people mimic and model a broad range of health(-risk) behaviors: specifically, the cigarette smoking, alcohol drinking, (un)healthy eating, and physical activity of others. We then discuss the neural and psychological mechanisms underlying these effects. Next, we outline moderators: specifically, we discuss when mimicking and modeling are more likely to occur, who is more likely to mimic and model, as well as who is more likely to be mimicked and modeled. Finally, we consider how mimicry and modeling could be used to leverage healthy behavioral change.

The "chameleon effect" refers to the tendency to adopt the postures, gestures, and mannerisms of interaction partners (Chartrand & Bargh, 1999). This type of mimicry occurs outside of conscious awareness, and without any intent to mimic or imitate. Empirical evidence suggests a bi-directional relationship between nonconscious mimicry on the one hand, and liking, rapport, and affiliation on the other. That is, nonconscious mimicry creates affiliation, and affiliation can be ex- pressed through nonconscious mimicry. We argue that mimicry played an impor- tant role in human evolution. Initially, mimicry may have had survival value by helping humans communicate. We propose that the purpose of mimicry has now evolved to serve a social function. Nonconscious behavioral mimicry increases af- filiation, which serves to foster relationships with others. We review current re- search in light of this proposed framework and suggest future areas of research.