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I have brought to you headcanons for Chuuya, Atsushi, and Dazai!
WARNING: These headcanons are about eating disorders and unhealthy relationships with food in general. I am not a professional and have not had any ED's myself, so these headcanons are based solely off of my research and conversations I've had with loved ones who have experienced them. Please seek professional help if you struggle with any eating disorders and proceed with caution.
EDIT: added all the tags I forgot
1. Atsushi has Binge Eating Disorder. Since the orphanage restricted his food so much, he eats uncontrollably a lot and tends to starve himself a bit in between binges. Kyouka knows and tries to help Atsushi, but I don't actually think a lot of the ada members know. Atsushi hides it well and Kyouka respects Atsushis wishes to keep it under wraps. Dazai probably thinks something is up but isn't sure, and Ranpo probably knows about it, but neither say anything to avoid making Atsushi uncomfortable or nervous. Atsushi doesn't really eat in front of people either. The only exception is snacking when he gets super bad hunger panes (I'm talking not going days with eating little to nothing, usually that happens because of mission). Even then he will only binge or really eat in general until he's alone.
2. Chuuya used to have ARFID (Avoidant/Restrictive Food Intake Disorder). Because of him living in the slums until he was 15, he got used to ignoring hunger panes and limiting how much he was eating because of a lack of food, so when he was accepted into the Port Mafia, he brought those habits with him, and would only eat a certain amount at specific times, usually when he was alone. He probably only ate certain foods like bread, canned products, mostly things that wouldn't expire or would provide a lot of energy without eating much. Koyou, Dazai, and the Flags all helped him work through it so he doesn't have it by the time Canon rolls around and is careful about maintaining a good relationship with food for their sakes. Koyou also checks in on him whenever they meet up.
3. Not really ED related and I've seen this one a lot, but Dazai has days where he has a food aversion because of his depression. The thought of or seeing food makes him sick, or sometimes it's just days where he doesn't feel hungry at all. The days range from being able to eat if its his canned crab, to only drinking a glass or two of whiskey if anything (I imagine that whiskey is a kind of comfort drink to him because of the days where he drank at bar lupin with oda and ango), to refusing to eat and drink anything, whether it's his safe/comfort food or drink or not. Kunikida knows this and it's the main reason he checks in on Dazai to see if he's eaten. I don't think Kunikida is entirely aware of his safe food and drink, though, so if it's one of those days, Kunikida will just take a lot of time gently urging Dazai to eat something. Ranpo also probably knows about it and will sometimes throw a piece of candy Dazais way on those days. The combined efforts usually convince Dazai to eat a bit of canned crab, though it's always alone. Chuuya also knows and will get on Dazai about not eating. He'll also prep some canned crab and keeps a bottle of whiskey at his place just in case. Sure they're not healthy at all but it's better than nothing. The food aversion days were more frequent and worse back when he was still in the PM, and he's gotten better with them now. Though they do still happen every now and then of course.