An unidentified patient told doctors that he had only eaten fried potato shop fish and chips, Pringles potato chips, white bread, slices of processed ham and sausage since elementary school, and he avoided textured foods. He first visited a doctor at the age of 14, complaining of fatigue, according to a case report published Monday in the Annals of Internal Medicine.
He did not take any medication, had normal BMI and stature and showed no visible signs of malnutrition.
Doctors discovered low levels of Vitamin B1
One year later, there were signs of hearing loss and vision, but doctors found no cause.
Until this stage, visual impairment was perma
Researchers at Bristol Medical School and Bristol Eye Hospital examined the case and concluded that the patient was suffering from nutritional optic neuropathy, optic nerve dysfunction.
In developed countries, it is mainly caused by bowel problems or medication. this interferes with the absorption of nutrients and is rarely caused entirely by a poor diet as food is readily available.
In some places, malnutrition caused by poverty, war, and drought is associated with higher levels of nutritional optical neuropathy, according to a statement. Fast food can contribute to teenagers' depression, the study says early, but it can lead to blindness if no action is taken.
"Our vision has such an impact on quality of life, education, employment, social interactions and mental health," says study lead author Denise Atan, an ophthalmologist at Bristol Medical School and Bristol Eye Hospital.
"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."  Researchers say poor diet and reduced mineral intake are caused vision loss in this case and warned that nutritional optic neuropathy could become more frequent due to the consumption of junk food.
They also warn vegans to make sure they are added to Vitamin B12 to avoid deficiency.
To prevent such cases, doctors should ask patients about their nutritional history as part of routine clinical examinations, the researchers urge.
An extreme example
Tom Sanders, professor of nutrition and dietetics at Kings College London, was critical of the case report, saying that he relied on his own recall of his eating habits and not takes into account other possible explanations for the condition, including genetic defects or environmental exposure.