Hello, yuanxinyan.
Welcome to Able2Know.
I can't speak for everyone in the West, as I'm only one person living in Canada.
However, I can tell you that today I had whole wheat toast with peanut butter for breakfast. I also had a piece of swiss cheese.
About three years ago, I asked people who post here at Able2Know what they were having for breakfast.
If you click on this link
http://www.able2know.com/forums/viewtopic.php?t=1299&highlight=
you'll be able to see how people responded to my poll, and what some of their specific breakfasts have been over the past three years. The majority of the people who responded live in Europe, North America or Australia/New Zealand.