GP didn’t say processed foods, but I can see why you went there because it’s a good point. That said, there are also those of us who can’t function without carbs (e.g. if I don’t eat them I will be too weak to work out or run, get light-headed, etc.).

That doesn’t mean they have to be processed, though, or that it requires gaining weight along with them. I personally survive primarily off of clean meats and homemade sourdough bread (which has literally 4 ingredients). If I cut out the bread I get hypoglycemic after runs and pass out. And with it, my weight stays around the same (though I’ve lost maybe 30lb in the last year or so due to just running more and lifting less).

Edit: and when I say “clean meats” I do not mean “lean” meats. Plenty of saturated fats. My bloodwork and other vitals are probably the best my doctor sees all year.