Exploratory Data Analyses Indicate Overuse of Dietary Supplements among Male Gym Users in Germany

Background: Dietary supplements (DS) are very popular with the general population, physically active people and professional athletes are often taken without professional advice. Adverse effects on consumer health are increasingly being reported and there are concerns about overdoses of certain nutrients. There are initial indications that some groups of people have a higher affinity to DS than others. It appears that the type of sport and possibly gym membership could have an influence on consumer behaviour. Therefore, this study aimed to identify high consumer groups of DS among the general population in Germany. Methods: The consumption of DS was assessed using an online questionnaire including information about physical activity, gym membership and the consumption and intake doses of DS. Completed questionnaires were returned by 244 participants (m=153, f=91; 30.7±10.4 years SD). The answer options were valued, and subjects were categorized in low, average and high consumers (indicating overdosing). A configural frequency analysis was performed using the independent variables gender, gym membership, consumption. The configurations were tested with an exact binomial test and the p-value was corrected according to Bonferroni (0.05/12=0.0042). Results: Three significant configurations were found (p≤0.0042). The configuration, ‘male-gym member-average consumption’ as well as ‘male-gym member-high consumption’ were significantly overrepresented. Male gym members with low consumption behaviour were significantly underrepresented. Conclusion: This analysis suggests that male gym users in the German population have a higher risk of excessive DS consumption than other subgroups. Awareness campaigns regarding the risk of intake and overconsumption of DS can be targeted to high-risk groups. Due to the small sample size and the different types of fitness gyms, further studies are needed to make clearer statements and identify more precise risk groups.