Earlier post: Swine and Mankind - The satiating power of dietary fat, mankind’s long history with swine, and the changes made to swine through genetic selection and some implications for humans fighting excess fat. ***************************************************************** During this country’s pioneer days the hog was the principal source of fat for the diet and lard was widely used for other purposes in everyday life. Two industries are responsible for displacing lard - vegetable oil processing and petroleum. Industrial processes were developed in the first half of the 20th century to extract, purify, and solidify various vegetable oils (hydrogenation). This created the vegetable-shortening industry. These processes made available vast sources of cheap oils. These could be converted into a texture that made them acceptable as shortening materials. All that was needed was a public relations campaign to convince the American public that these new industrial products were good f...