Yes😫 Both of mine have very significant issues around food, although for different reasons. For a while it literally dominated our lives and they did really unsafe things to get food or would eat very unsafe e.g. literally rotting food from neighbours bins. And although much improved its still a significant issue.
I'm replying more for solidarity than anything else though, I don't think I can be much help as mine are both primary age so much different in terms of my ability to control and guide them. Food issues are sooo hard and lonely to deal with as a parent. But all together it's made a big difference:
-very, very predictable food routines. I ensure there is never panic about if/when there will be food
-food in our house is social, eaten together, not alone and never in bedrooms
-younger DD is not in any way outdoorsy or active, would do nothing physical if she had the choice. I don't ever make her do exercise or anything that seems like it but try to build in being active wherever possible. It's hard as she's also disabled, but try walking to the shops, dog walks, loves music/dancing etc. But I'm really careful to not make her hate exercise even more than she already does. Just try to build being 'on the move' into each day.
-No shame or judgement ever, no talk about their appearances (although obvs I'm sure you already do this!)
-No talk of healthy food. No food is healthy or unhealthy in our house. I do talk about nutrition, for example I may casually talk about how this vegetable has lots of vitamins in, that helps our bodies grow strong. I also don't use the word calories but will talk about 'energy' in food, so if they've had a higher calorie dinner I may say 'I don't think I need as much energy at tea, can you help me choose something'
-no food as rewards. This is really hard but I really stick to this one. Food is never used to make them feel good, it's used to share together and nourish their bodies.
-the above also includes no Easter eggs, Christmas chocolates etc. It's just all they can think about and will fight to eat it all in one go. I give other gifts instead and ask family for money or themed little presents. Any food from school is eaten together e.g. share after tea with pudding or I'll swap it out for another present and we donate it to the food bank. I do hope this one will I can relax soon but for now they accept it fine.
-I do of course 'treat' them but never use the word treat. Treats are things to share together, never things they can binge on alone. E.g. trip to the seaside for fish and chips which is their absolute favourite.
-Try and get school onside. Their schools were originally not understanding but once they saw their behaviour/anxieties they understood more. School food is so poor and people don't take it seriously. I send in packed lunches, they are really nice lunches and take me ages but they're worth it.
-Make 'rules' clear to wider family.
-Nothing at all accessible in the house for snacks/binging. They can of course always ask me if they want something or there is always fruit and vegetables accessible to them (berries are much lower sugar, i couldnt leave out things like mango at the moment but a bowl of raspberries they can leave if theyre not hungry/anxious).
-linked to the above point I try to not set them up to fail. Leaving food out, eating little things in front of them, giving food as presents etc. is unfair to them.
-I always stick to the same standards they do, I always try to model healthy (in terms of mindset, and also nutritionally) behaviour around food.
-In meals I prioritise low calorie, nutrient rich foods. Lots of different types of veg cooked lots of different ways, proteins and healthy fats to fill them up, our food bill is high but its worth it!
-No rules about types of food e.g. at breakfast one of my children has porridge, the other has something not at all breakfasty like carrots, grilled corgette, cheese and bread. Or for pudding one of them has halloumi with chilli sauce 😂. But they are allowed to eat what works for them.