Objective: To understand the level and trend of health literacy among residents in Zhoushan City, Zhejiang Province from 2015 to 2023, so as to provide the reference for developing promotion strategies and interventions of health literacy. Methods: Permanent residents aged 15 to 69 years in Zhoushan City were selected as the survey subjects using a multi-stage stratified random sampling combined with population-size proportional sampling method. The residents' health literacy was investigated using the Questionnaire on the Health Literacy among Chinese Residents, and standardized by Zhoushan City population data captured from the national population census in China. The absolute increase and growth rate of health literacy level from 2015 to 2023 were calculated to investigate the changing trends in health literacy levels. Results: A total of 19 296 residents were monitored from 2015 to 2023, including 8 006 men (41.49%) and 11 290 women (58.51%), and had a mean age of (50.06±12.67) years. The health literacy levels among residents in Zhoushan City from 2015 to 2023 were 13.10%, 18.33%, 20.35%, 23.71%, 27.58%, 30.75%, 34.36%, 37.03% and 39.47%, respectively, showing an upward trend (P<0.05), with an average annual growth rate of 2.93%. The 9-year absolute increase rates of 26.37%, and the growth rate reached 201.30%. The health literacy levels of basic knowledge and concept, healthy lifestyle and behaviors and basic skills all appeared increasing trends (all P<0.05), and the 9-year absolute increase and growth rate of the basic skills were the smallest (7.64% and 34.60%). The health literacy levels of six categories of health issues all showed upward trends (all P<0.05). The health literacy levels of residents in different regions and genders showed upward trends (both P<0.05). Except for the age of 65 to 69 years, the health literacy levels among all the other age groups showed upward trends (all P<0.05). There was no significant changing trend in the health literacy level among illiterate/semi-literate residents (P>0.05), the health literacy level among residents with primary school education showed a downward trend (P<0.05), while the health literacy levels of residents with other educational levels all showed upward trends (all P<0.05). There was no significant changing trend in the health literacy level among farmers (P>0.05), while the health literacy levels among residents with other occupations showed upward trends (all P<0.05). Conclusions The health literacy level among residents in Zhoushan City steadily increased from 2015 to 2023. Health education and promotion efforts have been targeted at key populations of the elderly aged over 65 years, residents with a primary school education or below and farmers.

Objective To study the application of food hand measurement on the diet therapy and evaluate its rationality. Methods According to the method of stratified interception, 415 adults were chosen in Zhoushan City. Their height, weight, fist, hand palm and thumb size were measured. The cooked food volume measurement method was built by the daily dietary food exchange method of hand position measurement, the measured protein foods using the cube and vegetable or oil with common tableware. The cooked volume measurement method was compared with the weighing method applying to diabetic diet. Results The fist and hand palm volume in shorter people were (228.13-310.85) ml and (62.22-84.78) ml, those in the taller people were (250.00-388.95) ml, (68.18-106.08) ml, and those in taller people were (345.00-432.35) ml and (94.09-117.91) ml. In the same height group, when the one's weight was greater, the fist and hand palm volume were larger. When the weight was the same but the height was taller, the fist and hand palm volume were larger. The vegetable oil hand measurement was not appropriate by the measurement of hand position volume. The calories error of proteins and the staple food with hand measurements was larger than weighing method in the tall and obese people, that was not enough in the slim and short people. And the cooked volume measurement method that combined hand measurements with the cube and common tableware was appropriate to diabetic diet. Conclusion The hand measurement method combined with cube and common tableware box was suitable for diet therapy for diabetes. This method could be helpful to increase treatment compliance to balanced diet.

Objective To explore the expression of nutrition information based on consumer cognitive psychology,and improve the applicability of pre-packaged food nutrition labels.Method Taking the "nutrition label" of a biscuit as an example:First,the energy (kilojoules) of the biscuit is converted into "food exchange serving";Then,the energy supply ratio of three major calorigenic nutrients of various foods in the biscuit is calculated according to the "China Food Composition Table",and the energy supply ratio of three major calorigenic nutrient in different food combinations is also calculated.Finally,we determined whether energy supply ratio of the three major calorigenic nutrients of the biscuit is similar to a mix of certain energy ratios of certain types of food.Thus,the new nutritional information expression of'nutrition labels' was determined.The applicability and operability of balanced food practice was compared between the existing and improved nutrition information expression by the'desktop deduction'method.Results The biscuit contains 1 823 k] of energy per 100 g,which is about 5 "food exchange servings".The average energy supply ratio of protein,fat,and carbohydrate of all kinds of food are as follows:The cereals were 15％,5％ and 80％ respectively;the meats were 55％,39％ and 10％ respectively;the vegetables were 27％,9％ and 58％ respectively;and the fruits were 5％,3％ and 91％,respectively.If different types of food are mixed according to their energy ratio,then the energy supply ratio of the three energy producing nutrients is different.The energy ratio of the three energy producing nutrients of the prepackaged food will always be similar to that of the mixture of some kinds of food.The biscuit is similar to 1:4 energy mixed with oil foods and cereals,which translates to about 10 g of oils and 100 g of grains,based on the'food exchange serving'.Hence,if you eat 100 g of these cookies,subtract about 10 g of fat and 100 g of cereal from your three meals per day.Conclusion The nutritional ingredient list of'prepackaged food nutrition label'should increase the expression of 'food exchange'and food category and energy proportion,so as to facilitate the practice of balanced diet by consumers.