Identifying Distinct Profiles of Nutrition Knowledge and Dietary Practices, and Their Determinants Among Adult Women: A Cross-Sectional Study

<b>Background/Objectives:</b> The purpose of this study was to examine nutrition-related knowledge (NRK) and the implementation of national dietary guidelines (NDGs) as nutrition-related practices (NRPs) among women, identifying profiles and their determinants. <b>Methods:</b> A cross-sectional study including 1294 Polish women (mean age 35.8 ± 14.6 years) was conducted in the period June 2021-December 2022 using the Computer Assisted Web Interview (CAWI) method. K-means cluster analysis was applied to standardized variables (NRK and NRP scores, age, and BMI), with the optimal number of clusters determined using the elbow method, to identify major participant profiles representing knowledge and practices with respect to the NDGs. <b>Results:</b> Three distinct clusters were identified. The "High" cluster showed median NRK and NRP scores of 15 (IQR = 14-17) and 11 points (IQR = 10-13), significantly higher than those of the "Low" (11 (IQR = 9-13) and 8 points (IQR = 7-10); <i>p</i> < 0.001) and "Moderate" cluster (13 (IQR = 11-14) and 7 points (IQR = 6-9); <i>p</i> < 0.001), respectively. There were significant differences between clusters in socio-demographics, lifestyle, and health-related distribution. Cluster "High" (38% of sample) had the best NRK and NRP scores and more advantageous socio-economic and lifestyle profiles (higher education, employment, better financial situation, normal BMI, less smoking and higher levels of physical activity), <i>p</i> < 0.001; "Moderate" (39%) was characterized by average to relatively good NRK but weaker implementation of NRPs, particularly among younger women, representing more advantageous socio-demographic, lifestyle, and health-related characteristics (<i>p</i> < 0.001); and "Low" (23% of sample) comprising middle-aged and older women with lower education, more frequent rural residence, poorer financial status, less favourable lifestyle factors, the lowest NRK and NRP scores, higher prevalence of overweight or obesity, and the lowest level of physical activity (<i>p</i> < 0.001)-thus indicating a marked knowledge-practice gap, with this group constituting a potential high-risk population. <b>Conclusions:</b> Greater awareness of national dietary guidelines among women is observed alongside higher nutrition-related knowledge and healthier dietary practices. A persistent gap between knowledge and practical implementation among women highlights the need for interventions that support behaviour change alongside nutritional education. Targeted public health strategies are required for women with lower levels of nutrition-related knowledge and less favourable lifestyle profiles.