That's very interesting.
My diet has been all over the place in the last few years, trying to lose weight and get BG down. It looks as though I've been getting it wrong, but how to fix it is the problem. I have gut issues with vegetables and pulses, normal levels of carbs mean taking huge doses of insulin, which doesn't help with the obesity problem. ( I wasn't really overweight until I started taking insulin, at which point both BG and weight mounted rapidly.)
I did, for a while, lose weight on LCHF, but as soon as I put a small amount (usually about 20grams) of carbs back into my diet, on the advice of the diabetes nurses and dieticians, I put it all back on, and more, possibly because I had to use more insulin, or possibly due to calorie intake.
My concern at present is for damage I may have done, inadvertently, to my kidneys while protecting my liver, gut and blood pressure. Nothing has helped my arthritis one way or another apart from the fact that my excessive weight puts extra pressure on my joints making me almost immobile and unable to exercise.
Perhaps protein in the form of nuts is a way to go - they don't seem to do me any harm and I do find that coconut mixed with some vegetables ease my gut problems a bit. Could get very fed-up with nuts though.
I also saw a study about ancient folk eating lots of fat, but not the meat that went with it because the flesh was damaging to health in some way, but I didn't see all of it, so not sure why. But we are told by experts not to eat the fat. We are also advised to eat oily fish, but I wonder about that as well now. Is white fish alright? I have no idea any more. I thought I knew what I was doing, but it seems I was wrong again.