It's not that easy... Every kilo you put on feels miserable. One becomes fixated on ridding whatever food they receive from their bodies in any way, to not have the weighty heavy feeling. One feels a high and mastery over eating when they see their bones jut out. They feel like they are in control over food and eating and their devilish scales. They see the skeletal frame as a beautiful achievement. They feel beautiful with a light empty stomach. They loath themselves with any nourishment inside them.
It's so so sad.
I was waiting for someone with ED to infiltrate a health fasting forum with disordered thinking.
It really creeps up on a person and sucks them in. It's frightening. I've never had ED but I have felt it trying to creep in... One needs to fight it with everything they have. It's a mental battle.
The OP NEEDS!!! To calculate their daily required calories/ macros and increase by 20% to gain weight. Take up a discipline to redirect those fixated thoughts... Martial arts, sports, bodybuilding, dance.... Anything! But eat well and respect their body by giving it it's rights.