都 (dōu) is one of those characters that on the surface may seem simple, but actually has many different subtle uses. In this article, we will look at using 都 to emphasize quantity. It is Expressing quantity, Emphasizing.

Structure
You can use 都 (dōu) to emphasis the large quantity of something, particularly a group of people. The subject should be some sort of large group (like a majority of people or things), e.g. "很多人" or "大部分".

Examples
Hěn duō rén dōu xiǎnɡ jiǎnféi.
很 多 人 都 想 减肥。
A lot of people want to lose weight.