@mold_time No plastics were used back then. Now everything is in plastic. The reason why so many diets seem to help might be because of the lower plastic incidents among the packaging of things like a 5lb bag of potatoes or the Keto diet not having small plastic bags as it's containers.
@mold_time Has anyone ever thought about the fact that there has been a steady rise in the use of plastic packaging ever since the 70's. As a child cereal was in waxed paper inner lining. Paper bags with a coating contained your potato chips. Your cups at fast food places were waxed paper.