If someone sat you down today and said here's a bowl of crickets and snails and you're not getting up from this table until you've eaten them, how long do you think you'd be sat at that table?
After all, they're healthy. Do you think it might make you panic a bit, feel a bit queasy, maybe gag a bit from the slimy mucousy texture or the very obvious insect face. I reckon you could eat them, eventually, after you've rationally told yourself that they are just another form of food.
For children with ARFID, which can be caused by trauma from past food reactions, trauma from choking on certain foods, and sensory sensitivities, some normal healthy foods look like a bowl full of crickets and snails and it causes such intense anxiety that it feels like torture. They do refuse to eat. They will stick to what they know, what always has the same taste, texture and colour because it is safe and predictable. That is why most safe foods are beige and unhealthy and often branded because brands provide consistency.
My son will go days without eating at all if he so much as has a slight variation or someone tries to give him an asda sausage roll instead of a greggs sausage roll.
He has been hospitalised because of it. In hospital he wouldn't touch anything except ice lollies for 5 days.
He's losing weight rapidly, he is anaemic, he has significantly low vitamin D. He experiences fatigue from normal daily activity.
He was brought up on good home cooked healthy food, then just like his speech, he had a regression with food at around 18 months.
Thankfully I was still breastfeeding. Nearly cost me my job because my child would not eat any food at all, or drink water and I had to take so many breaks. We saw a paeds dietician and their advice was to continue breastfeeding because stopping wouldn't move him onto other things, it would just take away the one thing keeping him alive. This carried on until he was 4. Of course in that time we had to give him safe, predictable, and yes unhealthy food.
We do follow the Ellyn Satter division of responsibility feeding model for shared family meals, but I can't remove his safe foods or force him to eat something he isn't comfortable with.
At the end of the day would I rather have a child that eats chicken nuggets and sausage rolls, alive, so I can work on his diet at a pace that suits him, or would I rather have a dead child? I'm always going to go with the chicken nuggets and sausage rolls and squash and milkshake in that scenario.