Diversity of dietary protein patterns across Europe - Impact on nutritional quality and environmental sustainability.

Transitioning from animal-based to plant-rich diets could potentially improve both human and planetary health, but a thorough understanding of the protein component in the diet is essential. This research aimed to identify dietary protein patterns in the European adult population and evaluate differences in nutritional quality and environmental sustainability. Individual-level food consumption data were obtained from 25 European countries (40,101 participants, 18-64 years), available from the EFSA Comprehensive European Food Consumption Database. We applied statistical clustering to classify individuals according to their consumption of 24 protein source food groups. The patterns were evaluated for nutrient requirements, the Nutrient Rich Diet (NRD) 15.3 score, greenhouse gas emissions (GHGE) and land use (LU). Six patterns emerged: (42.2%), (19.5%), (14.8%), (12.0%), (9.8%) and (1.6%), with country-specific variations. Most patterns obtained 64-69% of their protein intake from animal products, except for the pattern (52%). The pattern achieved the highest NRD15.3 (+11%), and lowest GHGE (-20%) and LU (-25%) compared to the population average and was most commonly consumed in Austria, Finland, Spain, Portugal and Belgium (4.1-4.5%). The pattern also scored high in nutritional quality (NRD15.3: +9%), whereas the pattern showed higher environmental impacts (GHGE: +5%, LU: +7%). These findings highlight the diversity of dietary protein patterns across Europe, each with unique nutritional profiles and varying environmental impacts. The pattern provides a promising example for healthier, more sustainable diets, but tailored approaches that consider the cultural and demographic contexts of individual countries are needed to optimize health and environmental outcomes for all patterns.