My own arthritis issues (thumbs, like my Dad,) turned out to be gluten-related. Eggs, poultry, and red meat fat don't seem to affect them at all.
I've become an "inflammation monitor" in general, since I deal with rosacea and endometriosis, and what makes them flare up is too many carbs... simple as that.
We mustn't forget that very few of us have been eating low carb since birth, as nature seems to have intended. We are all dealing with decades of eating too many carbs, too much junk, and food which has been genetically messed with, sprayed with pesticides, and wrapped in plastic.
I am one who embraced eating like a cave-person with few bumps. Now, diabetes runs on both sides of my family and perhaps that means my metabolism is designed for such eating, anyway.
Essentially, I can eat up to Rung 5 of Atkins... meats, low starch veggies, high fat and cultured dairy, low sugar fruits, and spirits (thank heavens
Legumes, starchy vegetables, sugary fruit, and wine remain problematic and the source of my few "cheats." Grains are off the table completely; I'm not even remotely tempted.
I bring this up to explain how my own experience would support the thesis that carbs are the source of all issues. And yet, I know people here on this forum who do well going all the way to the top of the carb ladder, or lose better with a bit higher carb, or drop their grip over fruit, or who can't handle the levels of fat I eat routinely.
Health issues, genetics, childhood programming and emotional triggers all make us unique, but I think we'd all agree that
carbs are the problem.
What that means is still under debate.