I’ve been experimenting with different cheeses in my stovetop mac and to be honest, America/cheddar is still the best combo I’ve found. Was disappointed when a batch of smoked Gouda was still good, but not as good as the sauce made from “milk-product” slices and any old block of mild cheddar.
The meat isn’t why those people are overweight though. It’s correlation, not causation. If a person eats a meat only diet, more than likely they’ll reduce body fat and gain muscle mass due to the macros they are consuming. It’s all the easy calories and lack of exercise that makes so many people overweight.