Healthy and balanced diet as well as regular exercise are two of the foundations for establishing and maintaining a healthy lifestyle. To achieve that, many people choose to join fitness centers. There, personal trainers often offer nutritional advice in addition to their training guidance. The aim of this master thesis was to investigate the nutritional knowledge of both personal trainers and fitness users, to determine the frequency of use of dietary supplements, and identify the main sources of nutritional information. Using an online questionnaire, we were included 101 fitness users and 50 personal trainers. We found that both groups most frequently search for nutrition information on the internet. We also identified a high level of use of dietary supplements among both personal trainers and fitness users. Using the '49-Item Sports Nutrition Knowledge Instrument (49-SNKI) for Adult Athletes' questionnaire, we determined the participants' level of nutrition knowledge and compared between groups. The results showed that personal trainers have better nutritional knowledge than fitness users, but still less than satisfactory. We also found various knowledge gaps which suggest that there is still plenty of room for improvement for both personal trainers and fitness users.
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