The consumption of muscle-building supplements—ranging from protein powders and bars to creatine and pre-workout blends—has become an ubiquitous aspect of modern fitness culture among adolescents and young adults. These products are marketed with the specific framing of supporting increased muscularity, enhancing physical strength, improving overall athletic performance, and accelerating muscle recovery. Because these supplements are easily accessible and legal, they have seen a surge in prevalence, particularly within North American populations. However, the proliferation of these products occurs within a regulatory environment that is described as loose, raising significant concerns regarding their impact on both physical health and psychological well-being. The intersection of supplement use and psychological states is particularly critical when considering muscle dysmorphia, a clinical specifier of body dysmorphic disorder. This condition is characterized by a pathological pursuit of muscularity, where individuals are driven by a persistent feeling that their body is too small or insufficiently muscular, regardless of their actual physical size.
The relationship between the consumption of these products and the manifestation of muscle dysmorphia is complex. Muscle dysmorphia is not merely a desire for fitness but involves a variety of intrusive thoughts and feelings, such as an intense drive for size, and behaviors that may become maladaptive, including excessive exercise and rigid, muscularity-oriented dietary practices. These manifestations often lead to significant social and functional impairment. When the use of muscle-building supplements is analyzed in the context of these symptoms, a pattern emerges where the drive for increased muscularity is reinforced by the availability and marketing of these supplements. The psychological impact is further compounded by the ubiquity of the "muscular, lean, and toned" body ideal, which is promoted across social and digital media, creating a systemic pressure for young adults to modify their physiques through pharmacological and dietary means.
Analysis of Muscle-Building Supplement Prevalence
The use of muscle-building supplements is highly prevalent among adolescents and young adults in Canada and the United States, though the distribution of use varies significantly across gender identities. The most common categories of these supplements include whey protein powders, creatine monohydrate, amino acids, and pre-workout powders or drinks.
The demographic breakdown of usage highlights a gender-based disparity in the adoption of these products. Research indicates that among adolescent boys and men, the use of whey protein powders or shakes is exceptionally high, ranging between 55% and 80%. In contrast, the usage rates for adolescent girls and women are lower, falling between 33% and 50%. Transgender and gender expansive (TGE) individuals report usage of whey protein powders or shakes at a rate of 14% to 44%.
A similar, and perhaps more pronounced, disparity is observed with the use of creatine monohydrate. Over 50% of adolescent boys and men report using this supplement, while only 10% of adolescent girls and women do so. For TGE people, the use of creatine monohydrate is reported between 5% and 10%.
The prevalence of specific supplement types among those assessed reveals a preference for convenient and high-protein options.
| Supplement Type | Prevalence Among Users |
|---|---|
| Protein Bars | 63.4% |
| Whey Protein Shakes/Powders | 63.1% |
| Creatine Monohydrate | 25.5% |
Beyond the use of single products, there is a significant trend toward "stacking" or the simultaneous consumption of multiple supplements. On average, users consume 2.0 different muscle-building supplements, and a substantial majority—79.6% of participants—reported using at least one muscle-building supplement within the past 12 months.
Muscle Dysmorphia and the Clinical Cut-off
Muscle dysmorphia is characterized by a pathological pursuit of muscularity and is often measured using the Muscle Dysmorphic Disorder Inventory (MDDI). The MDDI evaluates several dimensions of the disorder, including Drive for Size, Functional Impairment, and Appearance Intolerance. A total score of 40 or higher on the MDDI serves as the clinical cut-off for diagnosing muscle dysmorphia.
The prevalence of scoring above this clinical cut-off varies by gender:
- Cisgender boys and men: 26.2% scored above the clinical cut-off.
- Transgender and gender expansive participants: 19.3% scored above the clinical cut-off.
- Cisgender girls and women: 11.8% scored above the clinical cut-off.
The mean total score on the MDDI across a general community sample of adolescents and young adults was 31.7. When broken down by subscale, the mean scores provide a clearer picture of how the disorder manifests:
- Drive for Size: 10.9
- Functional Impairment: 8.9
- Appearance Intolerance: 11.8
While the overall prevalence of muscle dysmorphia symptoms is higher among boys and men, there is a notable exception regarding Appearance Intolerance (muscle dissatisfaction), which was found to be higher among TGE participants and girls and women compared to boys and men.
The Correlation Between Supplement Use and Psychopathology
Research into the association between the use of muscle-building supplements and muscle dysmorphia reveals a positive correlation. Specifically, the use of all six identified muscle-building supplements, as well as the consumption of a greater number of supplements, is associated with greater overall muscle dysmorphia symptomatology.
The impact of supplement use manifests differently across the subscales of the MDDI. The use of these products is strongly associated with:
- Increased overall muscle dysmorphia symptomatology.
- A higher likelihood of scoring above the clinical cut-off of 40.
- Greater symptoms related to Drive for Size.
- Greater symptoms related to Functional Impairment.
Conversely, an inverse relationship was observed with Appearance Intolerance. Muscle-building supplement use was associated with fewer symptoms of Appearance Intolerance (muscle dissatisfaction). This suggests that while supplements may not eliminate the pathological drive for size, they may provide a psychological buffer against the feeling of dissatisfaction, or perhaps the act of supplementing creates a perception of progress that mitigates the immediate feeling of intolerance toward one's appearance, even as the functional impairment and the drive for more size increase.
Methodology of the Canadian Study of Adolescent Health Behaviors
To establish these associations, a comprehensive study was conducted utilizing data from 2,731 participants. This was a nationwide sample of adolescents and young adults aged 16 to 30 years, covering all 13 provinces and territories in Canada. This broad geographic and demographic reach ensures that the findings are representative of the general population rather than being limited to specific sub-groups, such as competitive bodybuilders.
The study employed several rigorous statistical methods to ensure the validity of the results:
- Multiple logistic regression analyses were used, treating each individual muscle-building supplement and the sum score (the total number of supplements used) as independent variables.
- The clinical cut-off for muscle dysmorphia was used as the dependent variable.
- A total of seven logistic regressions were conducted.
- Adjustments were made for sociodemographic variables, including age, gender, race/ethnicity, sexual orientation, and the highest completed level of education.
- Supplementary analyses stratified the models by gender, though TGE participants were excluded from stratification due to small cell sizes.
- Listwise deletion was utilized to manage missing data.
- The Benjamini-Hochberg procedure with a 20% false-discovery rate was implemented to account for potential Type I errors.
- Statistical analyses were executed using StataMP 18.0.
Risks and Societal Implications of Supplement Use
The widespread adoption of muscle-building supplements is not without risk. Because these products are loosely regulated, there are concerns regarding their safety and the veracity of their marketing. The use of these supplements has been linked to various adverse health and social outcomes.
Health risks associated with the normalization of these products include:
- Physical disability.
- Adverse health outcomes resulting from unregulated ingredients.
Social and behavioral risks associated with the culture of muscle-building supplement use include:
- Problematic alcohol use.
- The transition to the use of illicit drugs, specifically anabolic-androgenic steroids.
- Engagement in criminal behavior.
These risks underscore the necessity for health and mental health care professionals to be vigilant. The marketing framing of these products as tools for strength and muscularity, combined with the ubiquity of the muscular body ideal, creates a cycle where the pursuit of a specific physique can lead to clinical psychological distress. The fact that muscle-building supplement users often consume multiple products at once increases the complexity of these health risks.
Analysis of Research Gaps and Future Directions
Despite the strengths of current research—namely the use of large, diverse, and national samples—certain gaps remain. Prior research often failed to distinguish between legal supplements and illicit substances, such as anabolic steroids, conflating them into a single category. Additionally, many previous studies focused exclusively on bodybuilders, which skewed the data and limited the applicability of the results to the general community.
Current findings have expanded the understanding of how individual supplements and the quantity of supplements used correlate with muscle dysmorphia. However, a significant limitation persists: the inability to explicate the specific mechanisms that link the use of supplements to the development of muscle dysmorphia symptomatology. It remains unclear whether the use of supplements causes the intensification of symptoms, or if individuals with pre-existing muscle dysmorphia are more likely to seek out and use these products.
Future investigation is required to develop intervention strategies aimed at decreasing the use of normalized muscle-building supplements and mitigating the associated muscle dysmorphia symptomatology. The goal is to move toward a more balanced approach to health and fitness that does not rely on the pathological pursuit of muscularity.
Conclusion
The association between muscle-building supplement use and muscle dysmorphia is a significant public health concern. The data indicates that the more supplements an individual consumes, the higher their risk of experiencing clinically significant muscle dysmorphia. This relationship is characterized by an increase in the drive for size and functional impairment, even if it paradoxically leads to a decrease in appearance intolerance. The high prevalence of these products among young men and the emerging use among women and TGE individuals suggest that the "muscular ideal" is a pervasive force.
TheLoose regulation of the supplement industry, coupled with aggressive marketing, facilitates a culture where the pathological pursuit of muscularity is normalized. This can lead a trajectory starting with legal protein powders and bars, moving toward multiple supplement "stacks," and potentially culminating in the use of illicit anabolic steroids and other adverse social outcomes. The findings emphasize that the drive for muscularity is not just a fitness goal but can be a manifestation of a psychological disorder that impairs social and functional living. Professional intervention is necessary to alert users to these risks and to decouple the concept of health from the pathological pursuit of a specific, idealized body type.