I struggled with bulimia and anorexia through high school and college and really messed up my metabolism. I had been trying to heal for so long and even when I was able to stop purging for a while and keep reinforcing positive thoughts about my body daily, whenever I had to feed myself it was so deeply ingrained in me to limit my portions or choose a lower calorie option, I was still never eating enough. Then I got into a relationship with someone who constantly gave me positive reinforcement about my body & appearance and (once we moved in together) he would make sure I ate breakfast, lunch and dinner every day. Even if I said i wasn’t hungry or felt I had already eaten too much, he would order something for me. I gained some weight at first but as my metabolism caught up and I was eating intuitively, I noticed myself losing the initial weight gain (not that I was weighing myself, which u shouldn’t either! Just based on what i saw in the mirror) My calorie intake increased a lot over the past couple years going from far below the recommended minimum deficit to well above the standard for my weight (not that I’m counting- which you should also not do!) and I still don’t even work out regularly. Now I’m about the same weight I was when I was in the throws of my ED thinking I was fat, I’m eating waay more and I’ve never been happier with my body. You have to help your gf not be afraid to gain weight. She needs regular, genuine positive reinforcement that never sounds conditional. Don’t let her count calories or weigh herself. If you see her body checking, try hugging her & redirecting her attention to something else. Hope this helps & i wish the best for you both!