Re: Why do different breads shrink different amounts when toasted?

Hi!  This is an interesting question as I had never noticed the 
shrinkage. So I am assuming that you have been doing some actual 
measurements?  The factors that may be involved in this shrinkage would 
be the moisture content and the "structure" of the bread which is 
provided by the protein gluten.  The amount of heat added would also 
affect this change -- and would thus be different if different sizes and 
weights of bread were put into a toaster. Cheers.