I don't know the answer to your question about you in specific, but I have a genetic disorder that predisposes people to being super thin. One element of it is that fats are misprocessed.

I have made some headway on dealing with it. But, I mean, I wouldn't know where to begin to explain it and I have no idea how it relates to your experience. So, I mean, I don't know what pieces to even talk about. If I know someone has, for example, diabetes, I can come up with pertinent things to say, even though that isn't my condition.

There is a lot of info out there these days. You may be able to eventually hack this and find a means to put on weight.

Depends on your age, metabolism, and lifestyle. By the way, just because you cannot see it, it doesn't mean that irreversible damage isn't being done on your pancreas beta cells. There's a diabetes epidemic among thin Asians.