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This presentation will examine what food additives are
本讲将介绍何为食品添加剂
and if these ingredients are safe to be in our food.
以及这些添加剂在我们的饮食中是否安全
What exactly is a food additive?
到底什么是食品添加剂呢?
Technically a food additive is anything that you add to your food,
学术上认为食品添加剂是任何加入食品中的物质
but legally food additives have a different definition.
但法律上的食品添加剂概念不同
Let's take a look.
来看一下
Legally the term refers to any substance
法律上该词条指
where the intended use of which results directly or indirectly in its becoming a component
有意地加入到食品中使之直接或间接地成为食品成分
or otherwise affecting the characteristic of any food.
或者影响食品特征的物质
This definition includes any substance used in the production,
这一词条包含在产品生产，
processing, treatment, packaging, transportation or storage of food.
加工，处理，包装，运输和储存的任何物质
Basically its anything we add to our food whether it is to preserve it, add colour or flavour.
基本上它指我们加入食品的任何物质，无论是为了食品的储存，上色还是味道的提升
And can you name a common food additive?
你能够指出常用的食品添加剂么?
So why do we even use additives?
我们为什么会使用添加剂呢?
We use additives to preserve safety and freshness of food
是为了维持事物的安全新鲜
to add nutritional value and to improve food quality.
增加食物的营养价值，提升食品质量
For safety and freshness, mold, air, bacteria, fungi or yeast can easily ruin food without additives.
在保持食物的安全新鲜上，霉菌，空气，细菌，真菌和酵母很容易使不含添加剂的食品变质
Which is why we add them to food to give a longer shelf life and to keep the product fresher longer.
因此添加剂的放入能够使食品贮存时间，保持新鲜的时间更长
They can also help prevent fats and oils from becoming rancid and giving the product off flavour.
添加剂还能够防止油脂腐臭而导致食物变味
Another very important use is in the prevention of
添加剂的另一重要用途是
food borne illnesses and contamination and then for nutritional values.
防止食源性疾病和污染，提升食物营养价值
It's very common for a lot of our food to be fortified to add nutritional components
我们的很多食物中都加入其在加工过程中流失的营养成分，
that are lost in the processing or are insufficient in our pipeless diet.
或饮食中缺乏的营养成分，这是极为平常的
Adding nutrients to our food has helped to
食品中加入添加剂能够
prevent vitamin and mineral deficiencies and prevent malnutrition.
补充维生素矿物质并避免营养不良
All products containing extra nutrients can also be found on the label.
我们能够在所有食物标签中找到添加的营养物质
With regard to improving food quality
关于提升产品质量方面
natural artificial flavourings, coulour, spices and sweeteners are added to food
人造食用香料，颜料，调味料和甜味剂都加入食品中
to give the foods a better flavour texture and appearance.
以保证食品味道鲜美，质构精良，外观宜人
Things that help to improve quality would be emulsifiers
提升食品质量的叫做乳化剂
which add stability and thicken products.
它能够增加食品的稳定性，稠化食品
An example of this would be egg yolks which are commonly used as emulsifiers in various products.
比如蛋黄，它就在各种食品中充当乳化剂成分
Additives can also help to preserve the acidity or alkalinity of a product to help prevent spoilage.
添加剂能够帮助保持食物的酸碱度，从而使其不易腐烂
