If you’ve ever been under weight, how did you put on weight?

im underweight for my height, and dont know how to put fat on, i dont have any eating disorders or anything and dont starve myself...

If im working ill usually eat a sandwich, couple bags of crisps, a couple chocolate bars and have a cup of tea at 10:00am and again at 13:00 then come home and have a cooked dinner.

But when im not working ill usually just have dinner, and maybe a snack here or there, and when im working and have money i can have like 3 takeaway dinners a week.

Its not a healthy diet i know, but the food is being eaten and the calories are definitely there, my diet doesn’t seem any different to anyone i know who are normal weight...

If you’ve ever been underweight what did you do/eat to put fat on?

I smoke weed regularly if that could have anything to do with it.

Im very skinny and want to start putting on muscle, but cant if i havent got any body fat.

Thanks