Although the daily recommended amount of fish and shrimp in the "Dietary Guidelines for Chinese Residents 2007" has "50g~100g" and "75g~100g", no matter which one I say, I believe that Now most Chinese urban residents (not to mention the rural areas) have not reached this recommended amount. The quality of our diet needs to be improved.

　　Fish and shrimp (aquatic products) is rich in nutrients, protein content is 15%~22%, and is high-quality protein; vitamins are comparable or slightly higher than livestock and poultry meat; mineral content is Significantly higher than livestock meat. Compared with livestock and poultry meat, the biggest advantage of fish and shrimp is fat. Fish and shrimp have a low fat content, ranging from 1% to 10%, with an average of about 5%. They are mainly polyunsaturated fatty acids (while livestock and poultry meats are mainly saturated fatty acids). More importantly, many marine fish Fats of seafood and seafood also contain two special polyunsaturated fatty acids-docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA). These two omega-3 polyunsaturated fatty acids have been shown to have a variety of important physiological functions, such as promoting early nervous system development and regulating blood lipids. A large number of studies have shown that eating fish regularly can reduce the incidence of cardiovascular and cerebrovascular diseases. Therefore, as one of the "white meat", fish and shrimps are listed as the first choice in "Chinese Resident Dietary Guide 2007". How much do fish and shrimp need to eat each day? There are actually two sayings in the "Dietary Guidelines for Chinese Residents 2007", one is 50 to 100 grams per day; the other is 75 to 100 grams.

　　The questions to be discussed in this article have been generated in this way. When the Ministry of Health issued the "Dietary Guidelines for Chinese Residents 2007" on January 15, 2008, the figures given in the press conference record were recommended daily intake of 50 to 100 grams of fish and shrimp.

　　The first edition of the "Chinese Dietary Guide 2007" published by the Tibetan People’s Publishing House on January 1, 2008 (the editor of this edition is so poor that the cover did not contain the word 2007 on it, and the editor simply I don''t know there is a different dietary guide 1997 edition) also adopted the value of 50 grams to 100 grams. The illustration on the front page of the meal pagoda and page 41 are all this value.

　　However, when the fifth edition of the "Chinese Dietary Guidelines 2007" was published on December 1, 2009, the recommended amount of fish and shrimp has quietly changed. The illustrations on the front page of the meal pagoda and page 41 are values from 75 grams to 100 grams. The subsequent version has also been 75 grams to 100 grams. The two prints before and after (note that the version is the first edition) the values are actually different, without any explanation, and besides this value, the other content is almost the same! I am really puzzled.

　　 The most important question is, when the Chinese Nutrition Society, as the responsible agency for the establishment of the "Dietary Guidelines for Chinese Residents 2007", when did the recommended amount of fish and shrimp be quietly changed? Although 50g and 75g The difference is not big, but it can''t be changed. Did I not see the revised instructions made by Chinese Nutrition? Or did Chinese Nutrition have no explanation at all?