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A teenage boy goes blind after existing on Pringles, white bread and French fries

Eating a diet of French fries, Pringles and white bread was enough to make one teenage boy lose his sight, according to a case study published in a medical journal.Scientists from the University of Bristol examined the case of a young patient whose extremely picky eating led to blindness, and have warned of the dangers of a poor diet.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 first visited a doctor at age 14, complaining of tiredness, according to a case report published in the Annals of Internal Medicine on Monday.He wasn’t taking any medication, had a normal BMI and height, and showed no visible signs of malnutrition.Doctors discovered low vitamin B12 levels and anemia, treating the patient with vitamin B12 injections and offering dietary advice.One year later there were signs of hearing loss and vision symptoms, but doctors did not find the cause.

His vision had worsened to the point of blindness by 17 years of age, and doctors identified vitamin B12 deficiency, low copper and selenium levels, a high zinc level, reduced vitamin D level and bone level density, according to a statement from the University of Bristol.

By this stage, vision damage was permanent.Researchers from Bristol Medical School and the Bristol Eye Hospital examined the case and concluded that the patient suffered nutritional optic neuropathy, a dysfunction of the optic nerve.In developed countries it is mostly caused by bowel problems or medication that interferes with the absorption of nutrients, and it is rarely caused entirely by poor diet because food is readily available.In some places, malnutrition caused by poverty, war and drought is linked to higher rates of nutritional optic neuropathy, according to a statement.

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