Yum and McDonald's profits drop after supplier scandal

4. Starbucks

The latest fast food scandal in China has brought US coffee chain Starbucks products under the spotlight.

Starbucks said some of its cafes previously sold products containing chicken from Shanghai Husi Food Co, which was suspected of using expired meat.

The Seattle-based company has already provided 725,000 training hours for 14,000 employees in China and moved more than 110 young employees back to their hometown to become managers in new stores.

In 2013, Starbucks was questioned of using "toilet water" to brew its coffee after photos of a "Starbucks Only" water spout in a bathroom emerged on the web in Hong Kong.

Hong Kong-based tabloid Apple Daily first published images of the questionable practice along with a report stating that Starbucks staff fetched water from the public restroom in the building's parking garage several times every day and used it to brew coffee.

A man drinks a Starbucks coffee in New York, on July 11, 2013. [Photo/IC]