Here’s a cool 5 min video I found about the production of bread from the TV show ‘How it’s Made’

http://www.scivee.tv/node/2328

As far as industrial bread production is concerned most of the research points to the Chorleywood Process as the key to being able to make more bread faster and at a lower cost. The process however seems to also be responsible for the addition of ingredients that are not necessary in the making of homemade bread and that some suspect of causing various diseases and disorders. The bread that I ate was made in Canada by the Canada Bread Company in Ontario. Although I can’t confirm that the company uses the Chorleywood Process the presence of sorbic acid in the ingredient suggests that they do.

Sources:

http://www.allotment.org.uk/allotment_foods/bread-making/chorleywood-bread-process.php

http://www.independent.co.uk/life-style/food-and-drink/features/the-shocking-truth-about-bread-413156.html