One of the doctors behind the article in the Annals of Internal Medicine personally treated the "fussy eater" from Bristol over the course of three years, and said he was previously healthy and took no medicines.
Taylor says it's important to note that the quality of the carbohydrates you eat really does seem to matter.
"This case highlights the impact of diet on visual and physical health, and the fact that calorie intake and BMI are not reliable indicators of nutritional status", lead study author Denize Atan, Ph.D., consultant senior lecturer in ophthalmology at Bristol Medical School and clinical lead for neuro-ophthalmology at Bristol Eye Hospital, stated in the press release. He had a normal height and BMI index. That paltry collection of foodstuffs made up the entirety of his diet since primary school, when he was allowed to say he didn't enjoy the "textures" of fresh food and allowed to indulge in the freakish eating regime, simply rebranding himself as a "fussy eater" to get away with it.
The unidentified patient told doctors he had only eaten fries from the fish and chip shop, Pringles potato chips, white bread, slices of processed ham and sausage since elementary school, and he avoided foods with certain textures.
He was put on nutritional supplements and referred to a mental health expert for his suspected eating disorder. He also has a blind spot in the middle of his eyes. "That means he can't drive and would find it really hard to read, watch TV or discern faces", Atan told the BBC.
Furthermore, as it a very rare condition, not many people suffer from it.
His illness falls under avoidant-restrictive food intake disorder (ARFID), as he was not over or underweight, but he was as malnourished as a child growing up in poverty.
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While picky eating is fairly common with some kids, severe side effects are a rarity.
Some "picky" eaters have a lot more to worry about than not finding anything they like on the menu.
Dr Denise Atan, who treated him at the hospital, said he met the criteria for being registered blind, according to the BBC. "It was only after direct questioning that we learned the full extent of his abnormal eating behaviour". Vision problems followed soon after, the case study reports.
The body's cells need a variety of nutrients to function normally.
"[His initial doctors] said it was all in his head".
She explained because he wasn't gaining any weight, they didn't initially see a problem.
"He followed that diet for a number of years".
Deficiencies of vitamin B1 (thiamine), vitamin B2 (riboflavin), vitamin B3 (niacin), vitamin B6 (pyridoxine), vitamin B9 (folate), vitamin B12 (cobalamin), iron, calcium, magnesium, and copper are all known to cause optic neuropathy, and are easily misdiagnosed as other disorders without an adequate dietary history from the patient. He got a shot and dietary advice but didn't change his ways.