"나는 너무 뚱뚱해"라는 말은 많은 청소년이 일상적으로 내뱉는 부정적 신체 이야기다. 하지만 이제 "나는 너무 근육이 없어" 혹은 "나는 너무 근육질이야"라는 근육에 관한 불만족도 청소년 사이에서 그만큼 흔하다는 연구 결과가 나왔다.
강남 의과대학 공중보건학과 연구팀이 *Journal of Eating Disorders*에 발표한 이 횡단면 연구는 중국 청소년 818명(17-20세)을 대상으로 구조방정식 모델(SEM)을 이용해 식이 행동, 체성분, 부정적 신체 이야기 사이의 복잡한 관계를 분석했다. 부정적 신체 이야기는 '부정적 체지방 이야기(자신이 너무 뚱뚱하다고 불평)'와 '부정적 근육 이야기(근육 부족 또는 과다에 대한 불만족)'로 나뉘어 측정됐다.
분석 결과, 제한적 식습관(restrictive eating)이 두 가지 부정적 신체 이야기와 모두 연관됐다. 제한적 식습관은 부정적 근육 이야기와 β=0.12, 부정적 체지방 이야기와 β=0.35의 양적 상관을 보였다. 중요한 점은 매개 경로가 달랐다: 체지방 비율이 제한적 식습관과 부정적 체지방 이야기 사이를 매개했고, 근육량이 제한적 식습관과 부정적 근육 이야기 사이를 매개했다. 즉, 몸 어느 부분에 불만족하느냐에 따라 제한적 식이가 다른 신체 불만족 감정으로 이어지는 독립적인 경로가 존재한다.
성별 차이도 두드러졌다. 여학생이 남학생보다 제한적 식습관과 부정적 신체 이야기 모두에서 유의하게 높은 점수를 보였다. 이는 여성이 마름에 대한 사회적 압력을 더 많이 받는 반면, 남성은 근육량에 대한 기대가 다를 수 있어 불만족의 방향이 다르게 나타남을 시사한다.
흥미로운 발견은 부정적 근육 이야기가 '방향성'을 가진다는 점이다. 정상 체중에 체지방이 낮은 학생들은 체지방 지향 제한 식이를 보인 반면, 정상 체중에 근육량이 높은 학생들은 근육 지향 제한 식이를 보였다. 이는 같은 체중이라도 자신의 체성분 인식에 따라 다른 종류의 식이 행동과 불만족이 나타남을 보여준다.
이 연구는 횡단면 설계이므로 인과 방향을 단정할 수 없고, 중국 특정 지역 대학생을 대상으로 했으므로 일반화에 한계가 있다.
청소년 정신 건강 교육에서 신체 이미지 개선은 체중·체지방 관련 내용에만 머물러선 안 된다. 근육 불만족 — 너무 없다는 것이든 너무 많다는 것이든 — 도 심각한 심리적 부담이 될 수 있으며, 이에 대한 맞춤 교육과 상담이 필요하다. 특히 여성 청소년을 위한 신체 중립성(body neutrality) 교육이 강화될 필요가 있다.
📖 *The relationship between muscle- and body fat-oriented eating behaviors and negative body talk among adolescents in China (횡단면 연구, 818명)* |
논문 원문
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Most body image research focuses on one direction: feeling too fat. But for a growing number of adolescents, dissatisfaction runs in multiple directions at once — too much fat here, not enough muscle there. A new study disentangles these distinct pathways and finds that restrictive eating habits drive negative body talk about both fat and muscle through separate, measurable biological mechanisms.
Published in the *Journal of Eating Disorders*, the cross-sectional study surveyed 818 Chinese adolescents aged 17–20 years and applied structural equation modeling (SEM) to map the relationships among dietary behaviors, body composition, and two distinct forms of negative body talk: fat-related dissatisfaction and muscle-related dissatisfaction.
Mapping the Pathways
Restrictive eating — limiting food intake with the goal of altering body composition — was positively correlated with both forms of negative body talk. The association was stronger for negative fat talk (β=0.35) than for negative muscle talk (β=0.12), but both were statistically significant.
Crucially, the two pathways operated through different biological mediators:
- Body fat percentage mediated the link between restrictive eating and negative fat talk: eating less → changes in body fat → heightened dissatisfaction with perceived fatness.
- Muscle mass mediated the link between restrictive eating and negative muscle talk: eating less → changes in muscle mass → dissatisfaction with perceived muscularity (either its absence or presence).
This distinction is more than academic. It means that body dissatisfaction in adolescents is not a single phenomenon but a bifurcated one, with fat- and muscle-oriented concerns operating through different physiological pathways and potentially requiring different therapeutic approaches.
Who Experiences What
When researchers stratified participants by body composition and sex, a nuanced picture emerged. Adolescents with normal body weight but low fat mass tended to engage in fat-oriented restrictive eating behaviors, while those with normal weight but higher muscle mass showed muscle-oriented restrictive behaviors. Even when caloric intake appears similar from the outside, the internal motivation driving that restriction differs — and so does the emotional dissatisfaction it generates.
The Gender Gap
Female participants scored significantly higher than males on both restrictive eating behaviors and all measures of negative body talk. This aligns with extensive existing literature showing that girls face stronger social and cultural pressures toward thinness and body control. However, the study found that muscle-related dissatisfaction was present and meaningful across genders — not exclusively a male concern, as older research might have implied.
Girls may be dieting to become thinner, while boys may be dieting toward different body composition goals (more muscle, less fat simultaneously), but both ends up engaging in restriction that connects to body dissatisfaction. The psychological burden, the study suggests, may be heavier for girls in aggregate, but neither group is immune.
Directional Negative Muscle Talk
One of the study's novel contributions is characterizing "negative muscle talk" as directional. Dissatisfaction about musculature doesn't only mean "I wish I had more muscle." For some adolescents — particularly those who perceive themselves as too muscular relative to a thin ideal — the dissatisfaction runs in the opposite direction. This bidirectional nature of muscle-oriented body dissatisfaction has been underexplored in previous research.
Limitations
The cross-sectional design prevents causal conclusions. Because all data were collected at a single time point, we cannot determine whether restrictive eating leads to body dissatisfaction, body dissatisfaction leads to restrictive eating, or both arise from a shared third factor such as appearance-related anxiety. The sample was also limited to students in a specific Chinese university region, limiting generalizability.
Implications for Mental Health Education
Adolescent body image programs that focus solely on fat-related dissatisfaction — encouraging acceptance of higher body weight — miss a meaningful portion of the problem. Programs should explicitly address muscle-oriented body ideals, help adolescents develop realistic understanding of body composition, and promote body functionality over appearance. For girls in particular, expanding access to body neutrality frameworks and challenging cultural messages about both thinness and muscularity could reduce the psychological burden documented in this study.
📖 *The relationship between muscle- and body fat-oriented eating behaviors and negative body talk among adolescents in China (Cross-sectional study, n=818)* |
Source
※ This article is based on a published medical study. Individual health circumstances vary — consult your physician before making any changes to your care.
