There's a hypothesis that some part of the obesity epidemic stems from the widespread use of powerful emulsifiers in factory-produced goods. They attack the lining of the lower intestines (basically mucous) and wipe out chunks of our gut microbiota. I have no idea whether this is true, but once you realize that even "fresh bread from your local bakery" is often made using factory-produced Sodexo dry mixes, you see how easily this could affect everyone.