NUTRITION: Teenage boy goes blind after existing on Pringles, white bread and French fries.

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.

Where were the parents in all this?