A blue cheese bacon cheeseburger isn't necessarily "junk food". It can actually be pretty nutritious, depending on the specific ingredients.
A McDonald's hamburger is a good example of "meat" that would be good to limit.
As for other meats and dairy(which is just milk), most serious nutritional researchers will tell you to limit those if not nearly eliminate them from your diet. The media is constantly showing pro-meat stuff because the meat and dairy industry keeps funding pro meat research. It's especially confusing because even some of the largest companies/organization like the AHA and American cancer society is taking money from big meat and big dairy and funding pro dairy/meat research.
You can eat junk food filled with carbs (Standard white bread, pure pasta, white rice), likewise junk food full of fats. (Most milk products, highly processed meat.)
The main problem is when the diet is either lacking in things we do not completely understand (vitamins, micronutrients, perhaps phytonutrients) or is effective caloric surplus - that is, you gain weight.
Considering food x as carbs or y as fats or z as protein is reductive to the extreme not warranted by current state of knowledge and leads to milk powder and mashed potato diet. ;)
The basic nutrients do not have a quality other than perhaps the ease with which they're absorbed, which early matters for even somewhat unhealthy person, only perhaps for really sick people.
Our knowledge of more than coarse grained dietary needs and effects is grossly overestimated. That vacuum is exploited by commercial interests that typically vilify any form of consumption moderation, and focus instead on promoting one (over)consumption pattern over another.
"Eat lots of different things in moderation because honestly we do not know in enough detail what we need" is sound advice, but sadly just benefits the "patient" and not some profit maximizing economic lobby group.