@BearWithMe, do you think your protein and/or glucose metabolism may be poor and if so, could your thyroid need some support—I see your pulse is a little low? I ask because in my late 20s I too was unable to gain weight, while averaging well over 3,000 calories a day and I’m tiny. I’m normally 45 kg, but my weight plummeted—I was 30 kg at my lowest—and I had to stop mountain climbing due to my spine collapsing and having to learn how to walk again. Thankfully, I got a new doctor who put me on an ancestral diet that pretty much saved my life. I averaged 4 liters of raw milk, some cheese, eggs and meat (mainly scallops) daily and within 2 or so months I had regained 7 kg of mostly muscle (shown via a DEXA scan), but it wasn’t until I convinced my doctor years later to prescribe me standardized NDT (WP Thyroid) that I no longer needed crazy amounts of protein to not only maintain the weight I gained, but gain back the remaining weight I hadn’t, and I’m now able to maintain the 45 kg on 2,500 calories on sedentary days and roughly 4,000 on days I mountain climb.
Some quotes from Ray that may be of interest:
Thyroid Gland Recovery and Function Post Supplementation
"Contrary to popular ideas about thyroid, the gland will resume its functioning after stopping the use of a supplement even if it has been suppressed, and sometimes taking thyroid will increase the glands function to normal. Taking thyroid will sometimes help thin people gain weight, by improving protein metabolism, and it often helps people to sleep more soundly." Ray Peat
https://raypeatexplained.com/ray-peat-on-metabolism/
"In my teens and twenties, I needed about 8000 calories per day when I was physically active, about 4000 to 5000 when I was sedentary, but after I took thyroid, I needed only about half as many calories. Thyroid is the basic regulator of blood glucose, and it causes it to be fully oxidized for energy, so that it produces ATP efficiently, on relatively few calories. If blood glucose falls, because it's being used very quickly, the body responds with stress hormones, including glucagon, adrenalin, and cortisol." Ray Peat
