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This presentation will examine what food additives are
本講將介紹何為食品添加劑
and if these ingredients are safe to be in our food.
以及這些添加劑在我們的飲食中是否安全
What exactly is a food additive?
到底什么是食品添加劑呢?
Technically a food additive is anything that you add to your food,
學術上認為食品添加劑是任何加入食品中的物質
but legally food additives have a different definition.
但法律上的食品添加劑概念不同
Let's take a look.
來看一下
Legally the term refers to any substance
法律上該詞條指
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間接地成為食品成分
or otherwise affecting the characteristic of any food.
或者影響食品特征的物質
This definition includes any substance used in the production,
這一詞條包含在產品生產，
processing, treatment, packaging, transportation or storage of food.
加工，處理，包裝，運輸和儲存的任何物質
Basically its anything we add to our food whether it is to preserve it, add colour or flavour.
基本上它指我們加入食品的任何物質，無論是為了食品的儲存，上色還是味道的提升
And can you name a common food additive?
你能夠指出常用的食品添加劑么?
So why do we even use additives?
我們為什么會使用添加劑呢?
We use additives to preserve safety and freshness of food
是為了維持事物的安全新鮮
to add nutritional value and to improve food quality.
增加食物的營養價值，提升食品質量
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鮮上，霉菌，空氣，細菌，真菌和酵母很容易使不含添加劑的食品變質
Which is why we add them to food to give a longer shelf life and to keep the product fresher longer.
因此添加劑的放入能夠使食品貯存時間，保持新鮮的時間更長
They can also help prevent fats and oils from becoming rancid and giving the product off flavour.
添加劑還能夠防止油脂腐臭而導致食物變味
Another very important use is in the prevention of
添加劑的另一重要用途是
food borne illnesses and contamination and then for nutritional values.
防止食源性疾病和污染，提升食物營養價值
It's very common for a lot of our food to be fortified to add nutritional components
我們的很多食物中都加入其在加工過程中流失的營養成分，
that are lost in the processing or are insufficient in our pipeless diet.
或飲食中缺乏的營養成分，這是極為平常的
Adding nutrients to our food has helped to
食品中加入添加劑能夠
prevent vitamin and mineral deficiencies and prevent malnutrition.
補充維生素礦物質并避免營養不良
All products containing extra nutrients can also be found on the label.
我們能夠在所有食物標簽中找到添加的營養物質
With regard to improving food quality
關于提升產品質量方面
natural artificial flavourings, coulour, spices and sweeteners are added to food
人造食用香料，顏料，調味料和甜味劑都加入食品中
to give the foods a better flavour texture and appearance.
以保證食品味道鮮美，質構精良，外觀宜人
Things that help to improve quality would be emulsifiers
提升食品質量的叫做乳化劑
which add stability and thicken products.
它能夠增加食品的穩定性，稠化食品
An example of this would be egg yolks which are commonly used as emulsifiers in various products.
比如蛋黃，它就在各種食品中充當乳化劑成分
Additives can also help to preserve the acidity or alkalinity of a product to help prevent spoilage.
添加劑能夠幫助保持食物的酸堿度，從而使其不易腐爛
