Background: In China, many people are regarded suitable for participating in regular physical examination for diagnosis and prevention of diseases. Some simplified food frequency questionnaires have been designed and used; however, the accuracy of the questionnaire is absent. This study aimed to examine the reliability and validity of simplified food frequency questionnaire (SFFQ) used among adults undergoing physical examination in southwest region of China.Methods: This was a cross-sectional study conducted among physical health examination adults in the Southwest region of China. A total of 239 participants aged 20-65 were included from February 2019 to June 2019. The performance of SFFQ was evaluated by means of a three-day 24-hour dietary record (3R24). The relative validity and agreement was assessed by Pearson’s correlation and intra-class correlation coefficients (ICC), respectively.Results: The median energy-adjusted ICC of food groups between SFFQ2 and SFFQ1 was 0.59 (range: 0.49-0.73) and the ICC of nutrients was 0.47(range: 0.39-0.76). The Pearson correlation showed a valid comparisons between SFFQ1 and 3R24, ranging from -0.086 to 0.93 for food and 0.21 to 0.71 for nutrition, respectively. The energy-adjustment slightly increased the correlation coefficients.Conclusions: The reliability and validity of SFFQ was acceptable, and it could be an appropriate dietary assessment tool for the future epidemiological studies conducted among physical health examination adults of southwest China.Trial registration:CHiCTR, ChiCTR1900020934, Registered 22 January 2019, http://www.chictr.org.cn/edit.aspx?pid=35414&htm=4.

Background: In China, many people are suitable for participating in regular physical examination for prevention. Some simplified food frequency questionnaires have been designed and used. However, the accuracy of questionnaire is absent. This study aimed to examine the reliability and validity of simplified food frequency questionnaire (SFFQ) used among physical examination adults in southwest region of China.Methods: This was a cross-sectional study conducted among physical health examination adults in Southwest region of China. A total of 239 participants aged 20-65 were included from February 2019 to June 2019. The performance of SFFQ was evaluated by means of a three-day 24-hour dietary record (3R24). The relative validity and agreement was assessed by Pearson`s correlation and intra-class correlation coefficients (ICC), respectively. Results: The median energy-adjusted ICC of food groups between SFFQ2 and SFFQ1 was 0.59 (range: 0.49-0.73) and the ICC of nutrients was 0.47(range: 0.39-0.76). The Pearson correlation showed a validity between SFFQ1 and 3R24, which ranged from -0.086 to 0.93 for food and 0.21 to 0.71 for nutrition, respectively. The energy-adjustment slightly increased the correlation coefficients.Conclusions: The reliability and validity of SFFQ was acceptable. It could be an appropriate dietary assessment tool for future epidemiological studies among physical health examination adults in southwest China.Trial registration:CHiCTR, ChiCTR1900020934, Registered 22 January 2019, http://www.chictr.org.cn/edit.aspx?pid=35414&htm=4.

Background: In China, many people are apt to participate in regular physical examination as a prevention. Some simplified food frequency questionnaire have been designed and used. However, the accuracy of questionnaire is absent. This study was conducted to examine the reliability and validity of simplified food frequency questionnaire (SFFQ) used among physical examination adults in southwest region of China.Methods: This study was a cross sectional study among physical health examination adults in Southwest region of China. A total of 239 participants aged 20-65 were conducted during February to June in 2019. The performance of the SFFQ was evaluated by the mean of three-day 24-hour dietary record (3R24). The relative validity and agreement was assessed by the Pearson`s correlation and intra-class correlation coefficients(ICC) respectively. Results: The median energy-adjusted ICC of food groups between SFFQ2 and SFFQ1 was 0.59 (range: 0.49-0.73) and the ICC of nutrients was 0.47(range: 0.39-0.76). The Pearson correlation showed the validity between the SFFQ1 and 3R24, which ranged from -0.086 to 0.93 for food and and 0.21 to 0.71 for nutritions, respectively. Energy-adjustment slightly increased the correlation coefficients.Conclusions: The reliability and validity of the SFFQ was acceptable. It could be an appropriate dietary assessment tool for future epidemiological studies among physical health examination adults in southwest China.Trial registration:CHiCTR, ChiCTR1900020934, Registered 22 January 2019, http://www.chictr.org.cn/edit.aspx?pid=35414&htm=4.

Background: Evidence from trials about benefits and risks of low glycemic index diets to loss weight and modify cardiovascular risk factors is preliminary. It is unclear to health benefits of choosing a suitable food source and limiting fat. The aim of this study was to prospectively assess the effect of low glycemic index and fat restriction diet on weight control and cardiovascular risk factors of overweight/obesity individuals in Southwest China. Methods: Overweight/obese men (n=101) and women (n =153) were received low glycemic index with fat restriction diet intervention, dietary advice consistent with dietary portfolio principles between February and July in 2019. Specific dietary intervention lasted 3 months. Changes in weight, body composition, and blood chemistry profile were obtained. Results: After adjusting for potential confounders, the physical indicators were significantly different at baseline and after 3-momth intervention. All detected indexes were not significantly different between the male and female individuals. Compared with baseline before intervention, participants showed varying degrees of improvement in body mass index, BMI, waist circumference, percentage of body fat, visceral fat, cholesterol and triglycerides. Conclusions: For overweight/obesity individuals in Southwest China, regardless of the gender, low glycemic index and fat restriction diet might be helpful to control weight and cardiovascular risk.