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It was somewhat early on in there romantic relationship when John first learns exactly why Sherlock has such a big issue with foods like Mushrooms and hates when they get there takeout's anywhere else but the one shop he first got it from.
Of course it was sherlock's brother, Mycroft that told him this information in his normal dramatic fashion.
When a black car slowly roles to a stop next to John he simply roles his eyes and enters guessing it has something to do with his recent asking out of sherlock. Probably another 'hurt my brother and i will kill you' talks just more focused on the romantic relationship.
The car however was not empty as the British Government himself was sat in the car waiting for john to sit down and close the door.
"John i have something quick i believe you are in need of knowing now i am sure you will not leave" The voice was plain and commanding seeming to force John to sit in the car. "As you have most likely found out by now, sherlock has- food issues"
"Yeah? I have tried to get him to eat but no matter what i seem to do it never works" John grumbles thinking back on all the times he had tried to force sherlock to eat only to find the man still had not eaten anything let alone what he had made for him. John had felt almost hopeless about it for a while now.
"Ah yes, you see my brother dear has always preferred to starve then eat what he deems inedible" Mycroft paused letting john think on this information.
"Does he have an eating disorder? is that what you wanted to tell me?" John had suspected it for a while now but never wanted to ask in fear of offending the taller man.
"gold fish" Mycroft sighed, John could tell he was insulting his intelligence. "My brother does not have an eating disorder, he is autistic" Johns brain froze. Autistic huh. He looked back on a few memories he had and could see the shards fitting into one another all finally fitting just right.
"My brother has had safe foods for a while, they change on occasion but Honey and honey related treats have always been a safe net, it is connected to a safe memory which is why i believe it has always been a safe food for him" Mycroft has some human like smile on his face remembering what John can only guess is the Honey related memory. "sherlock always did like bee's"
There was no more important information from that conversation that John found valuable enough to use in the shopping he was now faced with. Honey and foods with honey in were in his bag already. He had to remember what sherlock had been willing to eat and came up with pasta, bread, tomatoes and cherries. All of these foods were in the basket but now John had an issue. Sherlock is always investigating a crime scene or on the move and if he doesn't have small snacks there is now way he can find any way to get sherlock to eat. So something small and probably with a good amount of honey in it to make it more appealing.
He was walking around the shop till he came down the sweet section where he found a 50 tub of these lollies completely made of honey, they were flat like coins but they would give him something small to eat while a crime scene if needed.
On arriving home John put the bags on the table where there was free space, something which was hard to find with all the vials and equipment everywhere but he did in the end before putting away foods that would need to go in the fridge, ignoring the severed hand and feet that lay in the bottom draw.
John had only been gone from the room for a few minuets and when he arrived back he found sherlock nibbling at the cherries, eating on his own free will. Soon, John hoped, this would be a normal and not an oddity.