I've heard some doctors saying it's ok to eat while some say cannot

Confusing sia!
However, the following 2 websites says chicken soup is a scientifically proven to help relieve cough!
http://www.buzzle.com/editorials/1-14-2005-64259.asp
http://www.unitedwaytwincities.org/Tipsheets/commoncold.cfm
Wonder is there a difference between eating chicken and drinking chicken soup?