Google does not show you ads basis on your gmail emails, Says google

Yesterday, Google shared a post on Facebook saying that google does not show you ads based on the emails you get in gmail. 

Google team also said that they don't show ads based on these:

1.Emails

2.Personal Documentation

3.Sensitive content

Google team said that they show ads based on a person's browsing history, website visits and previous ad clicks. Read The Facebook Post