主题：谈谈粤菜 -- 燕人

　　We aimed to determine sodium and potassium intake by systematically searching for and quantitatively summarizing all published 24‐hour urinary sodium and potassium data (ie, the most accurate method). MEDLINE, EMBASE, Scopus, China National Knowledge Infrastructure, and Wanfang were searched up to February 2019. All studies reporting 24‐hour urinary sodium or potassium in China were included; hospitalized patients were excluded. Data were pooled using random‐effects meta‐analysis and heterogeneity was explored with meta‐regression.

　　方法数据来自2010—2012年中国居民营养与健康状况监测，采用分层多阶段与人口成比例的整群随机抽样方法，调查对象为中国31个省份的150个县/区的18岁以上居民，共55531名。采用家庭连续3d24h食用油和调味品称重法调查家庭盐摄入量，依据家庭成员的膳食能量比计算个体食盐摄入量。

　　Total diet studies were undertaken in 2000 and 2009-2011 in 12 of China’s 31 mainland provinces. These provinces were selected to represent its geographic regions and dietary habits, and housed approximately 50% of its population. Eight additional provinces housing 29% of the population were studied in 2009-2012, expanding geographic coverage; only China’s far west region was not studied.

　　In each province’s total diet study, 1 urban district and 2 rural counties were randomly selected from lists of nonpoor districts and counties, representing typical dietary intake. Within each district or county, 2 communities or townships, then 5 neighborhoods or villages, and then 30 households were randomly selected. Study personnel recorded all residents’ dietary intake by recording food consumption and weighing ingredients, including salt, during 3 consecutive daily visits. No households refused to participate. Using local ingredients, matching foods were prepared and analyzed at China’s national reference laboratory. Using the age, weight, sex, and occupation of those surveyed, the daily salt and sodium consumption of a standard person (man, aged 18–45 years, weighing 63 kg, and engaging in light activity) was calculated for each province, to represent a value around which the sampled householders’ salt/sodium consumption varies. Meals consumed outside the home were excluded from the calculation.