I personally believe, and from experience, know that you CAN have a healthy relationship with food after an eating disorder. But it takes time and effort... to mend that broken relationship you have with food. The calories and knowledge of calories and macros doesn't go away, but you make them non triggers. That a 1500 kcal meal or a 300 kcal meal doesn't matter, it's food none the less. the knowledge that you ate a meal consisting of mostly carbs doesn't bother you and it doesn't bother you of you choose to eat a burger instead of a salad.
You learn to see food as food. As energy and a necessity, not something triggering or something that should make you feel guilty. Food isn't black or white or all or nothing. It's not good or bad either or healthy or unhealthy. Because it's just the amount you eat that makes food "healthy" or "unhealthy " or "good" or "bad".
After an eating disorder you need to take away the anxiety from food and not let food control you or have power of you. Food should be part of life but not your whole life. You shouldn't spend all day thinking about food but you shouldn't forget to eat either. It is possible to have a healthy relationship with food after an eating disorder but it will never be like someone who hasn't had any eating disorder. Because in some sense you are more aware about food and the content of food and the nutritional value of food. But also you make sure go eat your meals and feed your body right, compared to someone who has never had an eating disorder and doesn't eat regular meals and thinks absaloutly 0 about food, only when they are hungry. After an eating disorder you take care of your body and feed it right but can also have a healthier relationship to food than people who have never had an eating disorder because you allow yourself balance and know balance is key. You don't feel guilty over eating certain foods while some people who have never had an eating disorder can feel guilty over eating certain food.
Not following fad diets or getting stuck in counting calories or macros.
If you do find balance and health - find what works for you with eating and let food be an enjoyment and part of life, but not your whole life. Treating the body right and sometimes that means eating a whole Ben and jerrys (with no guilt!).
A healthy relationship is possible and that means working with your thoughts and how you view and think about food and knowing what is best for your body.