Sussex woman collapses after severe vitamin B12 deficiency discovered

Zita Wells, a 45-year-old pet carer from Sussex, UK, experienced a sudden and alarming collapse while shopping at her local drugstore. The incident, which she described as a "funny turn," left her sliding to the floor in a state of weakness and wobbliness despite remaining conscious. This event marked a dramatic shift from her usual active lifestyle; for months prior, she had felt unusually exhausted, breathless during dog walks that were once easy, and plagued by a sensation that her body felt like lead. Despite attempting to compensate with more sleep, she could not pinpoint the cause of her declining energy levels.

Following the incident, Wells secured an urgent appointment with her primary care physician, who ordered blood tests. The results revealed a severe deficiency in vitamin B12. This essential nutrient is critical for producing red blood cells, repairing DNA, and maintaining the health of the brain and nervous system. Wells admitted she was unfamiliar with the vitamin until her diagnosis, but the listed symptoms immediately clarified her condition.

Experts indicate that Wells is part of a growing demographic affected by what is termed a "silent epidemic" or "hidden hunger" of vitamin B12 deficiency. While the issue is global, current estimates suggest that approximately one in 25 American adults suffers from this deficiency. The prevalence increases significantly with age, affecting roughly one in five adults over 60, who often show abnormal biomarkers linked to low vitamin B12 status.

The rise in these cases is attributed to several factors, including an aging population, the increased use of medications that interfere with nutrient absorption, and the adoption of more plant-based diets. Because the symptoms—such as fatigue, brain fog, a sore tongue, and tingling in the hands and feet—are non-specific and common to many other ailments, cases are frequently overlooked or diagnosed only after months or years of suffering.

Furthermore, the reliability of available diagnostic tests is a significant concern. Experts warn that current tests correctly identify the condition only about 50 percent of the time. Consequently, millions of people may be living with undiagnosed deficiencies for years, risking irreversible nerve damage, heart failure, and even death. Professor Martin Warren, a synthetic biologist at the Quadram Institute, noted that two decades ago, the medical community believed nutrition was no longer a problem in developed nations. However, he emphasized that only in the last five years have people begun to recognize the persistent nutritional issues, with vitamin B12 deficiency serving as a prime example of a condition that is becoming more common as people age, yet remains inadequately tested and understood.

Vitamin B12 deficiency is a growing concern," according to experts. Known scientifically as cobalamin, this essential nutrient is primarily sourced from animal products including meat, fish, eggs, and dairy items like milk and cheese. For the general population consuming a balanced diet, obtaining the recommended daily intake of 1.5 micrograms is straightforward; this amount can be achieved through two large hard-boiled eggs or a 3-ounce serving of beef.

However, specific dietary choices significantly elevate the risk of insufficiency. Individuals adhering to vegetarian diets face a higher likelihood of low B12 levels, with vegans representing the group at particular risk. Research also indicates that diets heavy in ultra-processed foods contribute to deficiency. High-sugar, high-salt, and high-fat products tend to displace nutritious staples, leading to nutritional gaps.

While most cases of B12 deficiency manifest as mild symptoms—such as fatigue, pallor, a sore or swollen tongue, and cognitive difficulties including poor concentration and memory—prolonged or severe neglect can result in grave complications. These include vision loss, heart disease, cognitive decline, dementia-like symptoms, stroke, and, in rare instances, psychosis. The severity of the condition was highlighted this year following the death of 21-year-old university student Georgina Owen. A coroner linked her suicide to "delusional beliefs" stemming from a severe B12 deficiency caused by her vegan diet and lack of supplementation. An inquest revealed that Ms. Owen, from Essex, exhibited erratic behavior and a significant decline in mental health during the weeks preceding her death.

For deficiencies stemming from restrictive diets, the remedy is often simple: over-the-counter vitamin B12 supplements are effective for most. Yet, some individuals cannot absorb the vitamin regardless of dosage and require regular injections. Other causes include pernicious anemia, an autoimmune disorder where immune cells attack stomach cells, preventing absorption. Additionally, certain medications can induce deficiency; proton pump inhibitors like omeprazole reduce stomach acid, while diabetes medication metformin blocks absorption.

Older adults constitute another high-risk demographic. Professor Warren notes, "As we get older, our bodies produce less stomach acid. This is what breaks down food and releases vitamin B12 into our system." Consequently, adults over 60 are much more susceptible to deficiency. Age-related appetite loss further exacerbates the problem. Experts warn that the vitamin becomes increasingly critical as the body ages. Recent studies have investigated B12's role in aging and muscle function, revealing a disturbing truth regarding the health of the elderly population.

A 2026 investigation conducted by Cornell University revealed that insufficient vitamin B12 levels can disrupt DNA within muscle cells, ultimately triggering muscle wasting and a decline in physical strength. Although the natural aging process inevitably results in muscle loss—which elevates the risk of injury, spikes blood sugar, and limits mobility—researchers caution that a deficiency in this vitamin can accelerate this deterioration. Conversely, a separate study from the University of Alabama indicated that the issue might be reversible, following observations of older female mice that received vitamin B12 supplementation.

Professor Warren highlights the critical nature of this research, noting that current data increasingly identifies muscle strength as a superior indicator of longevity and mortality risk compared to body mass index. He warns of a compounding problem for older adults, who often face a "perfect storm" of factors that hinder nutrient uptake. These include the use of medications that impede vitamin B12 absorption and the age-related reduction in stomach acid production. "It's much more common than people realize. In a room of 20 people, one person, statistically, will have vitamin B12 deficiency. If it's a room of people over 50, that rises to one in five," Professor Warren states. He further observes that many individuals may unknowingly require supplementation.

Identifying the condition presents significant challenges, according to Dr. Ali Niklewicz, a nutrition scientist at the University of Surrey. She notes that symptoms such as tiredness, fatigue, tingling sensations in the extremities, and mental confusion are vague and can be attributed to various other health issues. "And many people can have a B12 deficiency for a very long time without realizing it," she explains. This lack of awareness often leads to misattribution of symptoms; for instance, women like Lucy Smith may wrongly link deficiency signs to menopause, which presents similar fatigue and cognitive issues. Professor Warren adds that some individuals mistakenly believe they have dementia, and in some cases, patients are incorrectly diagnosed with the condition.

Professor Warren also points to a gap in medical expertise, suggesting that nutrition has been removed from medical school curricula over recent decades. Compounding this educational deficit are flaws in standard diagnostic procedures. "The most common blood test measures the total amount of vitamin B12 in blood serum – but this marker is remarkably unreliable," he asserts. Because the body requires only minute quantities of the vitamin, measuring it in deficient patients involves detecting "a tiny amount of a tiny amount." Consequently, the standard test offers less than a 50 percent chance of an accurate diagnosis, yet remains in widespread use. More reliable alternatives exist, such as tests that examine the specific cells produced with vitamin B12 assistance, but these are costlier and less accessible. Professor Warren explains that when these cells are absent, it strongly indicates a deficiency, providing a much clearer measure.

Currently, patients with inconclusive test results are frequently denied treatment. Catherine Watkin, 57, experienced this reality after suffering from a severe deficiency for over two decades, a condition that frequently prevented her from working. "I was a recruiter in London in my early 30s when I suddenly began feeling unbelievably exhausted. I could hardly function – despite changing nothing else in my routine," she recalls.

Catherine Watkin endured a debilitating two-decade struggle with a severe vitamin B12 deficiency, a condition that left her frequently unable to maintain employment. Despite undergoing numerous blood tests and consulting a wide array of medical and alternative practitioners over the years, her physicians failed to identify the root cause of her suffering. In a desperate quest for relief, she spent an estimated $135,000 on various therapies targeting her thyroid and adrenal glands, underwent dental procedures, and pursued countless other treatments with no lasting success.

By the time she reached her 50s, her condition had progressed to include severe neurological symptoms. Catherine began experiencing searing pain at the tips of her fingers and noticeable brain impairment, forcing her to take significant time off work. The physical toll was so profound that even the simple act of taking a shower could exhaust her to the point of collapse, requiring her to lie down immediately afterward. For 15 years, she cycled through treatment after treatment to no avail.

The turning point arrived 18 months ago when a new physician, attentive to her specific symptoms, immediately suspected a vitamin B12 deficiency. Although her previous blood tests had indicated normal levels, the doctor referred her to a private clinic in Cambridge, UK. There, she began a course of vitamin B12 injections. The response was rapid; within just a few weeks, the overwhelming fatigue that had defined her life began to dissipate.

"It was miraculous," Catherine recalls. "Today, I'm totally symptom-free. I'm back to living my full, normal life. I just wish I had figured it out earlier."

Experts now emphasize that raising public awareness remains the most effective strategy to increase diagnoses, as current testing methodologies do not always catch the condition. They advise that anyone, particularly those over the age of 50, experiencing typical symptoms should bring them to a doctor and request a specific vitamin B12 test. Professor Warren notes that when test results fall into a gray area, it is always safer to err on the side of caution. He recommends that doctors refer patients with borderline results for more detailed testing and to monitor for improvement following vitamin B12 injections.

For those without a confirmed deficiency but who are concerned about their nutritional status, Dr. Niklewicz suggests maintaining a heightened awareness of dietary intake, especially as one ages. She specifically advises individuals on plant-based diets or those taking certain medications to ensure they take supplements. Furthermore, she warns that supplements should be taken with a meal; the spike in stomach acid required to digest food is essential for the proper absorption of the vitamin.

Dr. Niklewicz concludes by highlighting the importance of general awareness regarding nutritional deficiencies. "It's important that people are aware of vitamin B12 and nutritional deficiencies in general," she states. "But the good thing about it is that, once it's found, it's very treatable.