A good source of fats that are good for you are meat from animals that grew up eating their natural diets. Unfortunately corn-fed cows and pigs aren’t as good. I still eat them. It’s way better than sugar.
Although cuts of meat vary widely, in general most of the calories in a steak come from fat, not protein. According to Volek and Phinney, you really shouldn’t be getting more than about 35% of your calories from protein; higher often has deleterious effects. As I discuss over in Biology, our ancestors ate the fatty portions of the kill first. leaving the leaner, bonier parts for scavengers.
I’m going to need to build out a section of this site specifically to discuss fat. There are a mind-boggling variety of fats. In the interim, let’s leave it that animal tissues of animals raised on normal forage, as opposed to feed lots, have a fat profile that matches well to what your body evolved to process.
Now that I’ve stopped eating potato chips, one alternative are chicharrones from Food City. That’s a hispanic-oriented grocery chain, and those are pork skins fried in their own fat.
Like I said in Avoid Bad, don’t combine sugar with fatty meat products. If you eat a decent steak with vegetables and as little carbohydrates (potatoes, fries, soft drinks, etc) as possible, human-normal appetite control mechanisms will kick in. You get full and won’t want to overeat.