Well Barbara, if you look at the Italians, they are supposed to have the best diet in the world, and they only ever use Olive oil, they seem to keep changing their minds on food issues, I think if you have a good varied diet the you can't go wrong. My mum is in her nineties and her mum gave her bread and dripping for tea and the cheapest cuts of meat, so I really don'y know, it hasn't seem to do her any harm. She is a firm believer in eating fruit though.
Every Sunday my mum and one of her sisters used to go to the convent and ask the nuns nicely for a bowl of dripping. Like you say OC never did her any harm. She's now 92. Funny how the nuns always had good dinners. Never see any of the clergy go hungry do you?