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The asterix is used after the heading, percent daily value on the nutrition facts label.
标题下面用符号表示营养标签上的每日营养摄入百分比
And this refers to the footnote in the lower part of the nutrition label
这指的是营养标签后边部分的补充说明
which tells you quote, percent daily values are based on a 2000 calorie diet.
它告诉你含2000卡热量的食物的每日营养摄入百分比
This statement is regulated and must be on all food labels.
这一项是按照规定且必须列在食物标签上的
However the remaining information in the full footnote may not be on the package
而完整的补充说明上的其他成分可能会
if the size of the label is too small.
因为包装太小而不列出来
When the full footnote does appear it will always be the same,
如果出现的是完整的补充说明，那么所有食品上的内容是一致的
it doesn't change from product to product,
不会因食品不同而改变
because it shows recommended dietary advice for all Americans,
因为它就是为所有美国人提供的饮食建议
and it is not specific to any one food product.
并不仅局限于一种食品
Let's take a closer look.
让我们更细致地看一下这部分
Focus on the bottom of the food label where you see the word footnote.
注意食品标签底部标明补充说明的部分
The footnote is shown as a table for a daily calorie intake of 2000 or 2500.
补充说明以一个表格的方式说明日卡里路摄入量为2000卡到2500卡
Look at this amount listed in grams or milligrams and the footnote for total fat,
看一下其列出的以克或毫克为单位的脂肪总量，
saturated fat, cholesterol, sodium, total carbohydrate and dietary fiber.
饱和脂肪量，胆固醇量，钙以及碳水化合物，食用纤维量
These are the daily values for each nutrient listed and are based on public health experts advice,
这就是基于公共健康专家的建议列出的这些营养物的每日摄入量
the daily values are recommended levels of intakes.
即建议的摄入水平
Note how the daily values for some nutrients change,
注意一些营养物质的的日注入量发生变化
while others for example cholesterol and sodium remain the same for both calorie amounts.
而另一些如胆固醇和钙的两类的热量水平都没有改变
Again this table will contain the exact same information no matter
重申一下，无论你看的是哪种食品的食物标签
what food product nutrition label you are reading.
这一栏内容都是相同的
The percent daily values are listed on the right hand side of every food label
日营养摄入百分比列在食物标签的右侧
and based on recommendations for key nutrients
且这一百分比是以每日2000卡
but only for a 2000 calorie daily diet, not for 2500 calories.
饮食的为基础建议的，而非2500卡
Even though you may not know how many calories you consume in one day
即使你不知道每天食用的热量数
you can still use the percent daily value as a frame of reference
你也可以用这一百分比作为参考来衡量
whether or not you consume more or less than two thousand calories.
自己摄入热量是比2000卡高还是低
The main purpose of showing the percent daily value is that it helps you determine
提供这一数据的主要目的在于帮你判断
if a serving of food is high or low in a particular nutrient.
每份食用中的某种营养物量是高了还是低了
So this allows a quick and easy way to compare one product to another.
因此它可以使我们迅速简单地比较不同食品
You did not need to know how to calculate percentages to use the percent daily value
在使用日摄入营养百分比时，你不需要了解如何计算百分比
because the food label does the math for you.
因为食品标签已经为你算好了
The percent daily value column doesn't add up vertically to one hundred percent.
该栏数据并非垂直相加为100%
Instead each nutrient is based on the 100% of the daily requirements for the nutrient.
而是每种营养成分以该营养日摄入总量为100%为基础
So you can tell high from low and know
因此你可以从高到低依次识别并了解
which nutrients contribute a lot or a little to your daily recommended allowance.
哪些物质对你的日营养需求贡献大，哪些贡献小
