Feeling Foggy or Forgetful? Doctors Reveal How a B12 Deficiency Can Disrupt Your Brain
The nutrient shortfall can mimic early signs of dementia
One of the most common side effects of aging is forgetfulness or memory loss. You may find that details you used to recall easily are suddenly difficult to retrieve. When you think of improving your memory, you may picture puzzles or other brain games. While those strategies can help, it turns out that paying attention to your level of vitamin B12 (and increasing it if you’re deficient) can also make a big difference in improving your memory.
How a lack of vitamin B12 impacts your memory
If you’ve ever scanned the label on your multivitamin, you may have noticed vitamin B12 and not thought much of it. But a lack of this nutrient could impact your overall health and cognitive function.
“B12 plays a big role in keeping the brain sharp,” says Raj Dasgupta, MD, FACP, FCCP, FAASM, Chief Medical Advisor for Sleepopolis. “When levels are low, women often feel mentally foggy—like they’re forgetting things they normally wouldn’t or struggling to concentrate. Over time, a deficiency can actually damage nerves and impact mood and memory, so it’s not something to ignore.”
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Vitamin B12’s effect on brain function is also supported by research.
“MRI studies in humans have revealed abnormalities in structure and functional brain damage among people with vitamin B12 deficiency,” says Michael A. Smith, MD, Life Extension’s Director of Education, referencing research from EUREKA: Life Sciences. “These changes were associated with cognitive decline, which describes problems with memory and thinking.”
What’s more, a study published in the Annals of Neurology led by researchers at the University of California, San Francisco found an association between low vitamin B12 and impairment in neurologic function. Plus those with a shortfall of this crucial nutrient also had a greater volume of damaging brain lesions, says Dr. Smith.
Symptoms of a vitamin B12 deficiency
Waking up to symptoms of memory loss or cognitive decline, especially when you’re not sure what’s causing the issue, can be frightening. It turns out that memory loss symptoms can mimic those of vitamin B12 deficiency, and Dr. Dasgupta says it happens more often than we think.
According to the National Institute of Health, older adults are among the groups most likely to be deficient in Vitamin B12.
“B12 deficiency can look a lot like early dementia—memory problems, confusion, even mood changes,” says Dr. Dasgupta. “The difference is, B12-related symptoms can often be reversed if caught early. A simple blood test is the first step, and it should always be part of the workup when someone’s showing signs of cognitive decline.”
What to look out for
Memory loss can happen for a variety of reasons, including trauma, aging, health conditions and vitamin deficiencies, which can make it difficult to know what to watch for. Still, there are early symptoms that can help you catch it.
“It often starts with fatigue that doesn’t go away, even after a good night’s sleep,” says Dr. Dasgupta. “Some women notice tingling in their hands or feet, or that they’re more irritable or forgetful. Others have trouble concentrating or feel mentally sluggish. If those things persist, it’s worth asking for a B12 check.”
How to boost your B12 levels—and your memory
Now that we’ve established how important vitamin B12 is for brain health and a sharper memory, you may be wondering how to raise your levels. Fortunately, there are a few effective options.
“You can get vitamin B12 from foods like eggs, meat, fish and dairy. But if your body isn’t absorbing B12 well, food might not be enough,” says Dr. Dasgupta. “In that case, vitamin B12 supplements can help—usually a daily oral or sublingual form works well. For more severe cases, we sometimes use B12 shots to get levels back up quickly.”
Ultimately, while low vitamin B12 can affect brain health, recognizing the warning signs, prioritizing B12 through diet and supplements and seeking medical testing if you suspect a deficiency can help keep your memory sharp for years to come.
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