GCIOSGF Newsletter會訊：
你應該知道的事實
市售雞蛋除了蛋殼顏色有所差異外，很多時候在烹調時也常能發現蛋黃顏色有深有淺！但實際上不管是蛋殼或蛋黃顏色，基本與營養價值並無太大的關聯！而也有不少人會認為「蛋黃越紅，越營養」，但實際上，顏色真的會影響營養價值差異嗎？真相可能讓你失望！
白殼、黃殼雞蛋誰比較營養？其實差不多！
蛋殼顏色的差異，主要是與雞隻的品種有關。行政院農業委員會（簡稱農委會）就曾說明無論是蛋殼或是蛋黃的顏色，基本上與雞蛋的營養價值並無明顯的相關。
蛋殼顏色主要與品種有關，對雞蛋營養價值無顯著影響。
依據衛福部食藥署「食品營養成分資料庫」數據，若單以粗蛋白質之含量來看，黃殼雞蛋大約每100公克含有有12.5克粗蛋白，而白殼雞蛋則是12.6克，此外以各項維生素、礦物質含量來看更是微乎其微！況且一顆雞蛋若扣除蛋殼、僅以可食部位重量來計算，大約也才50幾克，其之間的營養含量差距也就更小！
蛋黃深淺受品種和飼料影響，但營養也同樣差異不大
農委會說明，蛋黃的顏色深淺不同與蛋的營養成分較無關聯！但為什麼蛋黃顏色會有深淺之別呢？臺灣海洋大學食品科學系副教授張正明說主要與蛋雞品種有關外，其所攝取的飼料也會影響蛋黃的顏色。
蛋黃顏色深淺不一的主因除了與品種有關外，與飼料成分也有關係，但蛋黃顏色與雞蛋本身養分較無關聯！
蛋黃顏色可人為控制！飼料色素可影響蛋黃顏色！
此外，張正明也補充，一般來說，飼料中所含的色素成分也常會影響蛋黃顏色，若是飼料中的天然色素成分，如：葉黃素或是β-胡蘿蔔素等含量較高，蛋黃顏色可能就會變得比較深！若是透過餵食調控、給予添加不同色素之飼料，甚至可以得到有彩色蛋黃的雞蛋。因此他也說明，普遍學界都認為，蛋黃顏色並不能拿來作為判斷營養價值的指標！
Facts you should know
In addition to the differences in eggshell color among commercially available eggs, you can often find that the egg yolk color varies from dark to light when cooking! But in fact, whether it is the color of the egg shell or the yolk, it has little to do with the nutritional value! And many people think that "the redder the yolk, the more nutritious it is." But in fact, does color really affect the difference in nutritional value? The truth may disappoint you!
Which is more nutritious, white shell or yellow shell eggs? Actually almost the same!
The difference in eggshell color is mainly related to the breed of chicken. The Council on Agriculture of the Executive Yuan (referred to as the Council of Agriculture) once stated that neither the color of the eggshell nor the color of the yolk has any obvious correlation with the nutritional value of the eggs.
Eggshell color is mainly related to the variety and has no significant impact on the nutritional value of eggs.
According to data from the "Food Nutrients Database" of the Food and Drug Administration of the Ministry of Health and Welfare, looking at the crude protein content alone, yellow-shell eggs contain approximately 12.5 grams of crude protein per 100 grams, while white-shell eggs contain 12.6 grams. In addition, Judging from the vitamin and mineral content, it is even more negligible! Moreover, if the shell is deducted and the weight of the edible parts of an egg is calculated only, it is only about 50 grams, so the difference in nutritional content between them is even smaller! The depth of egg yolk is affected by the variety and feed, but the nutrition is also not very different.
The Council of Agriculture explains that the different shades of egg yolk color have little to do with the nutritional content of the egg! But why are there different shades of egg yolk color? Zhang Zhengming, associate professor of the Department of Food Science at Taiwan Ocean University, said that in addition to the breed of laying hens, the feed they consume will also affect the color of the yolk.
The main reason for the different shades of egg yolk color is not only related to the variety, but also related to the feed ingredients. However, the color of the egg yolk has little to do with the nutrition of the egg itself!
The color of egg yolk can be controlled artificially! Feed pigments can affect egg yolk color!
In addition, Zhang Zhengming also added that generally speaking, the pigment components contained in the feed often affect the color of the egg yolk. If the natural pigment components in the feed, such as lutein or β-carotene, are high in content, the color of the egg yolk will be affected. It may become deeper! If you control the feeding and provide feed with different pigments, you can even get eggs with colored yolks. Therefore, he also explained that the academic community generally believes that the color of egg yolk cannot be used as an indicator to judge nutritional value!
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