fat isn't 'just fat'. Not by a long shot.
My eyes can barely stay open at this point. But basically, if it comes from an animal, it is good fat. If it comes from plants, it can be either good (olive, nuts, etc) or really bad (rape, soy, etc)
If it's saturated naturally, it is good (ie animal fat). but if it is altered to be useful for cooking, it is bad - almost all vegetable oils, anything they use to fry with in restaurants is terrible. (But they were forced to by the idiots who spread misinformation that saturated fat is bad, so now we're left with hydrogenated vegetable oil which is far worse)
I thnk one way that may or may not work (not sure, haven't put much thought into it) is if you are eating something and you know the fat is there, it's usually good fat. For instance fat on a steak, or delicious butter. But if the fat is 'hidden' and in there to artificially boost flavour, it is usually bad (potato chips, dressings, etc). Again this isn't 100%, just a theory I have been pondering.
And yes there is good cholesterol, and it all comes from good fat. There is also bad cholesterol, and good-bad cholesterol
One last thing to think about. Check out the ingredients for Wendy's 'normal' cheese used on most burgers:
Cultured Milk, Water, Cream, Sodium Citrate, Salt, Sodium Phosphate,
Citric Acid, Sorbic Acid (preservative), Artificial Color, Enzymes, Soy Lecithin.
And then their 'natural swiss cheese'
Cultured Part-Skim Milk, Salt, Enzymes
Which one sounds more appetizing?