Since this popped up again, I don’t think I could do a study like this without a good CGM and CKM. And even then, the study would be quite difficult. I think you’d have to make up foods, like eating very high protein, low fat foods (think ham and shrimp) and combining that with fat (I guess animal fat you cut off or get somewhere?). I’ve been using beef chuck lately, and putting it in the sous vide for 24 hours, cooling it down, cutting it up for lunches. The problem is that the fat content is all over the map. Today, what I had was quite fatty, but the other day, it was not. Unless I’m willing (which I’m not) to separate the fat from the meat after cooking, and weigh each of them separately, then I wouldn’t have a good idea of what the protein:fat content is.
That’s why I think you’d have to eat very high protein, low fat meat, then add fat. This way, you’d get a better estimate of protein:fat ratio.
This is why I think it’s easier to eat high protein like lean beef, ham, etc., then high(er) fat, like chuck and other fatty meats. It’s not an ideal situation, but I can’t see eating ham then a hunk of fat by itself.