Re: why does eating deep fried food makes one more susceptible to sore throat?

This belief is part of the yin-yang concept of Chinese philosophy.  This 
philosophy reflects the interaction of two basic opposing forces of the 
universe--yin (female, dark, cold) and yang (male, light, hot).  
Followers of this philosophy believe there is a necessity to maintain a 
balance in the body and in the diet between yin and yang.  Fried foods are 
usually considered to be yang foods and an imbalance toward yang foods 
is thought to increase susceptibility to infections such as sore throats.  
There is little scientific evidence to back this philosophy, however, it 
has many followers.

Davidson, The Oxford Companion to Food.  1999.  Oxford Press.