to know what you're eating in those foods.

我们在进餐时到底摄入了些什么成分
But packaged foods have labels, and this is made possible

但包装食品的食品标签可以告诉我们这些
because of government action taken some years ago.

这得益于几年前的政府措施
When you look at a food label like this,

这是一个食品标签的样例
first it shows you the number of servings on containers.

首先可以了解到整个包装内所含食物份数
Of course you guys are savvy enough to know this,

大家很聪明当然看得懂
but a lot of people get fooled

但还是很多人搞不清它的含义
because many people believe that a serving is

因为很多人认为所谓一份食物就是指
what's ever in a bag, or a bottle, or a box, and

一包一瓶或一盒内的食物总量
they don't look and see how many servings are actually in it.

而没看清整个包装内实际上有几份食物
As a consequence, they're underestimating the number of calories they're consuming.

因此人们会低估实际摄入的热量
So that's part number one.

这就是食品标签的第一部分