A British teen doctors described as a "fussy eater" was partially blinded because of his diet, which consisted of nothing but fries, chips and the occasional slice of ham.

The case has been reported in the peer-reviewed Annals of Internal Medicine, the flagship journal of the American College of Physicians, and described how the boy had been treated for health problems related to his poor eating habits since he was 14.

When he was 15, the boy started experiencing hearing loss. Credit:Bloomberg

"His diet was essentially a portion of chips from the local fish and chip shop every day. He also used to snack on crisps - Pringles - and sometimes slices of white bread and occasional slices of ham, and not really any fruit and vegetables," Dr Denize Atan, who treated him at the hospital, told the BBC.

His family practitioner first prescribed him injections to treat a vitamin B12 deficiency and told him to change his diet when he came in reporting "tiredness," but the boy did not keep with the treatment, nor did he change his diet, according to the case study.