Millions of people in the UK are at risk of serious health complications, including irreversible nerve damage, heart failure, and even death, due to undiagnosed vitamin B12 deficiency. Experts warn that this 'hidden hunger' is becoming increasingly prevalent, particularly among older adults, vegetarians, and vegans.
Vitamin B12, also known as cobalamin, is crucial for producing red blood cells, repairing DNA, and maintaining a healthy brain and nervous system. It is primarily found in animal and dairy products. While most individuals obtain sufficient amounts from a balanced diet, certain groups are at higher risk of deficiency.
Overlooked Symptoms and Diagnostic Challenges
One of the primary reasons for delayed diagnosis is the non-specific nature of the symptoms, which can include fatigue, brain fog, sore tongue, and tingling in the extremities. These symptoms often develop slowly and can be mistaken for other common ailments or the menopause, leading many to suffer for years without a correct diagnosis. Zita Wells, 45, experienced extreme fatigue, wobbliness, and brain fog, which she initially couldn't pinpoint. It wasn't until a sudden dizzy spell in a chemist led to blood tests that she was diagnosed with a severe B12 deficiency.
Experts also point to the unreliability of current testing methods. The most common test, measuring total B12 in blood serum, is estimated to be accurate only about 50% of the time. This inaccuracy means that many individuals with genuine deficiencies may receive normal results, leaving them untreated. Professor Martin Warren, a synthetic biologist at the Quadram Institute, highlights that only in the past five years have people begun to recognize the extent of ongoing nutritional problems in developed countries, with B12 deficiency being a prime example.
High-Risk Groups and Severe Consequences
While an estimated one in 20 Britons are affected by B12 deficiency, this figure rises to one in five for adults over the age of 50. As people age, their bodies produce less stomach acid, which is necessary for releasing B12 from food, increasing their susceptibility. Older adults are also more likely to be taking medications that can interfere with B12 absorption, such as proton-pump inhibitors and metformin.
Beyond fatigue and cognitive issues, prolonged or severe deficiency can lead to serious complications, including vision loss, heart problems, cognitive decline, dementia-like symptoms, stroke, and even psychosis. The case of Georgina Owen, a 21-year-old university student who died by suicide, was linked by a coroner to severe B12 deficiency exacerbated by her vegan diet and lack of supplements.
Addressing the Deficiency
For many, the solution is straightforward. Dietary changes, such as including more animal products or taking B12 supplements, can resolve the issue, especially for vegetarians and vegans. Lucy Smith, 54, who had symptoms she attributed to menopause, found immediate relief with B12 injections after being diagnosed with a deficiency.
However, some individuals struggle to metabolize B12 effectively, requiring regular injections. Others, like Catherine Watkin, 57, faced a prolonged diagnostic journey, spending years and an estimated £100,000 on various treatments before a new doctor suggested B12 deficiency. Despite normal blood test results, she was put on B12 injections and experienced a significant improvement.
Experts advocate for increased awareness among both the public and medical professionals. They suggest that anyone experiencing persistent, vague symptoms, particularly those over 50 or following restrictive diets, should discuss B12 deficiency with their doctor and request appropriate testing. If initial tests are borderline, further investigation or a trial of B12 treatment, such as an injection, may be warranted to rule out the condition and prevent potentially devastating long-term health consequences.