Will trans fats be forbidden in the Forbidden City?

The Reuters news agency said the coffee shop chain had taken the decision following last month's announcement of a ban at half of its US outlets.

Trans fats are created by a process called hydrogenisation, which hardens the fats and improves their shelf life.

However, there is concern that trans fats may raise cholesterol and contribute to heart disease.

Several US chains including KFC and Taco Bell have already announced plans to switch to other oils.

New York's board of health has agreed plans to outlaw most use of trans fats at its 24,000 restaurants.

Denmark has imposed a national ban on the use of the fats.