I’m sorry but this reads like Healthy At Every Size/Fat Activism propaganda. Metabolically privileged?!
I'll take this hit. what do I know about someone else that I'll call
"metabolically privileged"? probably less than nothing.
I'll explain, I've been pearshaped most of my life. and, I've been subject to peers who would readily use this to impugn me, in various capacities. it would seem that there's at least some residual resentment.
Also typing out these diatribes while still being firmly within the obese camp, seems strange to me.

this is me when I graduated boot camp - I was about 185. I never cracked the 180 screening weight. Not once. so I always had to get taped for body fat percentage calculations.
I came out of 6 months of initial training thinner, what I now consider gaunt. I could see my hip bones rather clearly hugged by the skin, and my waistband was about 29 inches. a pair of 30-inch shorts actually wouldn't stay up without a belt.
was I overweight at 5' 10"? as the BMI of 26.5 would imply? looking back, I don't think so. I think I was underweight. And I think a lot of metabolic damage accompanied all the muscle that was lost in spending the time to prep uniforms write letters and shower, I spent most of that time 200 yards away at the track running because I was never that fast. and I never got faster in about 6 months. My time was flat all 4 times I was tested. within a few seconds of each other. even though I came into training a little chubbier at over 200 lbs. but making tape, by the slimmest of margins, at initial entry. I lost a bunch of weight, and by the shape of my limbs and seeing bone under the skin, at 185 some of that was definitely muscle.
at my worst, my waistline sailed past 45 inches on its way to 50 while I was running daily - mostly out of desperation trying to convince the army not to kick me out.
it was during this time that I was helping my brother move out of the house, I was helping him carry a reel-to-reel tape recorder down the stairway. near the bottom, I missed a step and my ankle was sprained severely.
In light of this - A Full Bird Colonel was convinced by Retention to sign off on a 6-month extension, predicated on the injury and the promise that I'd be able to stay in, because, it was his signature, if I didn't make it, it'd come back to bite him.
it was in the midst of recovering from injury, getting MRI scans, which I paid dearly for - cash - out of pocket, and preparing a packet for a permanent profile to be submitted to the surgeon general that the retention NCO mentioned in the book.
And, it was while I was without the ability to exercise with any potency, that is when protein power saved my career.
I passed tape with flying colors. and the Colonel was relieved. eventually, the packet was processed and the permanent profile was granted, and I became a walker on the APFT walking very quickly, 2.5 Mi. in ~ 30 min.
Why can you speak on nutrition when you have yet to be within a healthy BMI and have no formal education on it?
There were a couple of people I knew, who I had access to, who was some kind of medical professional, who was willing to try to help me.
Notably, my sister-in-law was an RN in charge of a floor, at kaiser.
She was very assertive about her knowledge of nutrition as a part of her education.
her recommendations were more or less to limit meat to 3.5 oz per meal, and 1300 calories or less per meal.
I was starving. and I hate her advice. love her, she meant well. but, it's painful to feel hungry 24/7. and I did.
Like other experiences within this paradigm, I was more lost and hopeless after giving it a try, failing, and being told it was my fault.
I view nutrition (and fitness) as a meritocracy, if you have no success within it you shouldn’t speak until you do.
I have limited success with it, with myself. very narrowly defined progress from a time when I was getting rounder out of control, to the slowest re-comp the world has ever seen, a decade or so in the making.
This is me the other day, in control of what and when I eat. Working with weights 3x a week. Eating meat. Training explosively.

My waistline is floating around 36 -38 inches . I weigh 245 lbs . Am I obese ? Sure. According to a BMI calculator I'm absolutely obese.