Have you heard about the chemical Bisphenol A? It is used in  most canned 
goods worldwide. It migrates into the food and may be a cancer  causing 
substance. Sorry to throw out a curve ball.
 
Robin
 
 
In a message dated 12/16/2010 7:12:38 P.M. Eastern Standard Time,  
[log in to unmask] writes:

I eat  canned sardines (with skin and bones intact) either packed in water 
or extra  virgin olive oil.  I've noticed they cause mild belching.  I've 
read  that with respect to fish oil supplements, this reaction could mean  
rancidity.  Any thoughts as to whether this could be the same with canned  
sardines?  My husband thinks the bones are causing the issue because  calcium 
can have this side-effect.  Thoughts?  It would be hard to  give up my beloved 
sardines -- so tasty and  economical.