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To identify food purchase patterns and to assess their carbon footprint and expenditure. Cross-sectional. Purchase patterns were identified by factor analysis from the annual purchases of 3435 product groups. The associations between purchase patterns and the total purchases' carbon footprints (based on life-cycle assessment) and expenditure were analysed using linear regression and adjusted for nutritional energy content of the purchases. Loyalty card holders ( 22 86 of the largest food retailer in Finland. Eight patterns explained 55