why do you need to gain weight??? what you describe is a good functioning metabolism. only thing you can do is eat more protein and train to put on muscle, you will not gain fat until you purpoesfully break your metabolism.
Idk, maybe all the “you’re too skinny” “you’re anorexic” “you need a .milkshake” I’ve been hearing all my life.
But yeah muscle is the kind of weight I’ve tried to gain. In my early 20s I spent 6 days a week in thr gym for 6 months and only gained 15 lbs. I drank 4L of milk a day. I ate a breast of chicken every day. I took in as .any grams of protein per meal, as I weighed in lbs. I took mutant mass and farted it all out. It was exhausting. Then I started a new career, and life got too busy to keep at it, spending 2-3 hrs a day in traffic. It was just too much so I lost all that weight
I mean, yeah a bit of fat would be neat too. But I find that just as hard to put on as muscle. Holy hell I don’t think I could take in any more food than I already do, idk where it all goes!