yeah, to be honest, i'd be concerned about rendering conventionally raised pork fat into lard and relying on that as my main cooking fuel. next to egg hens, pigs are probably raised in the worst conditions of any of the industrial animals. their fatty acid profiles respond to their feed much more than ruminants. in other words, though cows are raised in horrible conditions and fed grains, CAFO beef will not have a drastically different fat composition than grass-fed beef. the PUFA in lard can vary in extreme amounts.
"dean ornish and dr. davis think the palmitic acid our bodies use for fuel while we sleep is poison if we eat it. zero-carbers like charles washington think the oldest fuel in our evolutionary history – glucose - used by organisms a billion years ago and without which the brains of modern mammals cannot survive for more than a few minutes – is an unnatural toxin if you eat it. both views ignore basic facts of medical physiology and defy evolutionary history." - kurt harris