Polyunsaturated Oils and Cancer

Up to the 19th-century, fat was relatively expensive and butter was a luxury. The poor lived mainly on potatoes and bread, which were cheap, supplemented whenever possible with whatever source of protein and fat they could afford. Not surprisingly, mortality was high amongst the poorer classes. To fill the gap in the market cheap substitutes for butter began to be produced in the last quarter of the Victorian era. Made from cheaper fats and coloured yellow to mimic the look, if not the taste of butter, they were called margarine. And this started, quite slowly at first, a radical change in the types of fat we, as a nation, ate.