Poor Diet Poses Risk to Sight
By the wlr team
Clinician scientists from Bristol Medical School and the Bristol Eye Hospital examined the case of a teenage patient who first visited his GP complaining of tiredness when he was 14.
Aside from being a “fussy eater,” the patient had a normal BMI and height and no visible signs of malnutrition and took no medications.
Initial tests showed macrocytic anaemia and low vitamin B12 levels, which were treated with vitamin B12 injections and dietary advice.
When the patient visited the GP a year later, hearing loss and vision symptoms had developed, but no cause was found.
By age 17, the patient’s vision had progressively worsened, to the point of blindness.
Further investigation found the patient had vitamin B12 deficiency, low copper and selenium levels, a high zinc level, and markedly reduced vitamin D level and bone mineral density.
Since starting secondary school, the patient had consumed a limited diet of chips, crisps, white bread, and some processed pork.
By the time the patient’s condition was diagnosed, the patient had permanently impaired vision.
The researchers concluded that the patient’s ‘junk food’ diet and limited intake of nutritional vitamins and minerals resulted in the onset of nutritional optic neuropathy.
Nutritional optic neuropathy is a dysfunction of the optic nerve which is important for vision.
The condition is reversible if caught early.
Left untreated, it can lead to permanent structural damage to the optic nerve and blindness.
The Bristol researchers who examined the case recommend clinicians consider nutritional optic neuropathy in any patients with unexplained vision symptoms and poor diet, regardless of BMI, to avoid permanent vision loss.
In developed countries like the UK, the most common causes of nutritional optic neuropathy are bowel problems or drugs that interfere with the absorption of various important nutrients from the stomach.
Purely dietary causes are less common because food supply is good, but elsewhere in the world, poverty, war and drought are linked to malnutrition and higher rates of nutritional optic neuropathy.
The Bristol team suggest the condition could become more prevalent in future, given the widespread consumption of ‘junk food’ at the expense of more nutritious options.
They also point out the potential risk in the rising popularity of veganism if the vegan diet is not supplemented appropriately to prevent vitamin B12 deficiency.
The team recommend dietary history should be part of any routine clinical examination like asking about smoking and alcohol intake.
This may avoid a diagnosis being missed or delayed. Important because some associated visual loss can fully recover if the nutritional deficiencies are treated early enough.
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References & Resources
Poor diet can lead to blindness news release from Bristol University
Toxic and nutritional optic neuropathy wikipedia