I am like 5'7 and thin af (55kg) I am eating absolutely

Start lifting. You don't want fat, you want muscle.

>>17238240
Exercise. You may get slightly thinner in the beginning, but muscles weigh quite a lot, so you'll gain weight in time.

>>17238240
read the sticky on /fit/ you faggot.

to gain weight you need to eat more calories than you expend. it's just a numbers game.

you should lift but don't listen to the autist that suggests that the weight difference between muscle and fat is somehow a means to effectively gain weight. that's literally fucking retarded.

eat more food = gain weight. you may as well lift/be active while you do so you don't look like shit.

>>17238240
Is MC Donalds a rapper dressed as a clown?

>>17238249
THAT.
5 days a week for one month, you'll see results trust me.
I did boxing for one month just like that, perfect