My mother and my grandmother always cooked with bacon, salt pork, and the saved greases, as well as butter. I never managed to crack 120# until I entered engineering school, stopped competitive long-distance running and Nordic skiing, and started planting my butt in a desk-chair for 3-4 hrs a night studying. Really lean! Every summer, my parents would let me spend a week or two with my grandparents, and my grandmother would load me with cream and berries in the morning, with bacon, eggs, and fried potatoes, etc for breakfast. Every meal went the same. She tried to put 5# on me every week because I was "too skinny". She was brought up on a farm, and fed river-drivers as a cook, so she knew how to fuel calorie-burners.