Department of Nutritional Sciences, Faculty of Medicine, University of Toronto, Toronto, ON M5S 1A8, Canada.
Nutrients. 2019 Nov 15;11(11):2782. doi: 10.3390/nu11112782.
The association between the degree of processing and healthfulness of foods remains unclear. Most evidence of this relationship is based on dietary intake surveys rather than individual products and varies depending on the food processing classification system used. This study aimed to compare the nutritional quality of more- versus less-processed packaged foods and beverages in Canada, using a large, branded food database and two processing classification systems. Nutritional information for products ( = 17,269) was sourced from the University of Toronto FLIP 2017 database. Products were categorized using the NOVA and Poti et al. processing classification systems. Calories, sodium, saturated fat, total and free sugars, fibre and protein per 100 g (or mL) were examined by processing category using descriptive statistics and linear regression. Overall, the most-processed products under both systems were more likely to be lower in protein, and higher in total and free sugars, compared with less-processed foods ( < 0.05); the direction and strength of the association between other nutrients/components and level of processing were less consistent. These findings demonstrate that calorie- and nutrient-dense foods exist across different levels of processing, suggesting that food choices and dietary recommendations should be based primarily on energy or nutrient density rather than processing classification.
食品加工程度与健康之间的关系仍不清楚。这种关系的大多数证据是基于饮食摄入调查,而不是单个产品,并且因使用的食品加工分类系统而异。本研究旨在使用大型品牌食品数据库和两种加工分类系统,比较加拿大加工程度较高和较低的包装食品和饮料的营养质量。从多伦多大学 FLIP 2017 数据库中获取产品(=17269)的营养信息。使用 NOVA 和 Poti 等人的加工分类系统对产品进行分类。使用描述性统计和线性回归,按加工类别检查每 100 克(或毫升)的卡路里、钠、饱和脂肪、总糖和游离糖、纤维和蛋白质。总体而言,与低加工食品相比,两种系统下加工程度最高的产品的蛋白质含量较低,总糖和游离糖含量较高(<0.05);其他营养素/成分与加工水平之间的关联方向和强度不太一致。这些发现表明,在不同的加工水平上存在高热量和营养密集型食品,这表明食品选择和饮食建议应主要基于能量或营养密度,而不是加工分类。