The Polish scientific achievements linked with habits and food preferences surveys are wide-ranging and varied, and the progressing globalization causes the interest in cross-cultural comparative analyzes to more and more increase. In order to obtain reliable results of such comparisons, it is necessary to apply standardized, cross-culturally validated tools. One such tool is FRL (Food Related Lifestyles), an instrument used in research studies on dietary habits and preferences and designed, specifically, to make comparisons among different cultures or countries. The majority of European countries were surveyed using the FRL instrument. It was proved that the FRL instrument is capable of sufficiently withstanding cultural differences and can be applied in comparative studies. The objective of this research study was to verify whether or not the FRL instrument is an accurate measuring scale and can be utilized in the Polish cultural environment. An additional objective was to check whether or not the method of collecting data (personal interview and on-line survey) impact the reliability of the FRL instrument. Two data collection methods were applied (personal interview and on-line interview). In the case of personal interview, a two-stage stratified sampling scheme was applied. The place of residence (region) was a first-stage sampling unit (region), and the number of households was a second-stage sampling unit. The on-line questionnaire was freely available and all interested persons could fill it in. 948 respondents from all provinces in Poland and in all demographic groups provided their responses. The reliability was assessed using a Cronbach’s alpha index pursuant to the methodology as proposed by Grunert at al. Based on the analysis results, it was found that in the case of constructs relating to buying motives and methods for preparing meals, the accuracy of measuring scale was relatively low; however, it was confirmed that the FRL instrument was reliable with regard to Poland and suitable for cross-cultural comparisons.