Abstract: Objective To understand the status of nutrition claims of prepackaged foods and the relationship between nutrition claims and nutrients and energy,provide scientific basis for nutrition claims to reflect the nutritional value of prepackaged food and guide people to choose food reasonably. Methods From March to September 2021,food labels were comprehensively collected from nutrition claims,nutrients and ingredients in four large supermarkets（Sugo,Walmart,Golden Eagle and RT-Mart） and three online supermarkets（Tmall,Suning Tesco and Jingdong Mall） in Nanjing City,and the information was entered into Excel to analyse the labelling of nutrition claims in food products,and to analyse and compare the energy and nutrients in similar food products with and without nutrition claims. Results This study included a total of 4 473 prepackaged food label samples from eight categories,and the proportion of food products with nutrition claims was 17.24% of the total number of food products surveyed. The cereal products and dairy products had the highest labeled rates,which were 226 and 152 samples,with the labeled rate of 35.48% and 33.70% respectively,followed by condiments,beverages and confectionery products,which were 215,117 and 31 samples,with the labeled rate of 24.52%,21.59% and 14.35%. The meat,aquatic and egg products,fruits and vegetables,bean products and nuts were generally lacking in the use of nutrition claims,which were 11,8 and 6 samples,with the labeled rate of 1.15%,1.69% and 1.86%,respectively. The cereal products made nutritional claims mainly for fat and dietary fiber,while dairy products made claims mainly for calcium,fat and protein.For carbohydrate claims,the number of claims for "sugar-free""sucrose-free" and "low sugar"was high and was found in a wide range of foods,with 51,24 and 21 samples,respectively. The sodium was limited to condiments and was mainly indicated as "low sodium". Some differences in the energy and core nutrient contents between the nutrition claimsgroup and the non-nutrition claimsgroup were statistically significant. The carbohydrate contents of cereals[63.00（50.80,72.00） vs 60.50（52.00,67.40）],dairy[12.00（5.00,52.50） vs 11.00（5.00,17.50）] and sugars[89.70（56.50,98.00） vs 74.80（61.20,87.60）] in nutrition claimsgroup were higher than those in non-nutrition claims group,and the differences were statistically significant（all P<0.05）. The sodium content of condiments in nutrition claims group was higher than that in non-nutrition claims group,and the difference was statistically significant（P<0.05）. There were not statistically significant differences in energy and core nutrient contents of fruits and vegetables,meat and aquatic products between nutrition claims group and non-nutrition claims group（all P>0.05）. Conclusions The labeled rate of nutrition claims on prepackaged food in Nanjing City is low,and the labeled rate and nutrition claims of different categories of food are different. The nutritional value of foods with nutrition claims does not have an advantage over the corresponding group without nutrition claims,so in order to prevent misleading claims on packaging,clearer information should be presented to help consumers make more informed choices and view nutrition claims more correctly.

Key words: Prepackaged food, Nutrition labelling, Nutrition claim, Nutrients