I haven't seen that book, but thanks for recommending it. I'll look into it. I have looked at the research that shows heart disease increasing at the same time as the U.S. moved from animal fats to vegetable fats, which makes a lot of sense when you think about it. In our normal diets we would encounter animal fats and our bodies are made to handle those, but there's no natural way to have the amount of vegetable fats end up in our diets if we're just eating vegetables. And once they started hydrogenating the vegetable oils the heart disease rates skyrocketed. Plus, peanut butter cookies made with beef tallow are the best I've ever had. I think lard works the same, but I don't eat pork.