The secret supplement that can fix brain fog

If you’re battling brain fog and struggling to concentrate at work, or simply feel flat-out exhausted, the chances are you’ll reach for a caffeine fix or sugary snack. But before you do, consider this: it could be time to reach for a lesser known, healthier pick-me-up. 

Vitamin B12 is an often overlooked vitamin which is essential to keep our brains sharp and our nervous system firing on all cylinders. It is also key to healthy blood cell formation. 

This month, the Medicines and Healthcare products Regulatory Agency (MHRA) alerted doctors to the risk of vitamin B12 deficiency in people taking metformin, a widely used treatment for type 2 diabetes, which affects how efficiently the vitamin is absorbed by the body. In a drug safety update, it suggested that patients with risk factors for B12 deficiency should be monitored. 

But what about the rest of us: could low levels of vitamin B12 be to blame for our waning powers of concentration? 

“Meat, eggs, fish and dairy products are the primary dietary sources of vitamin B12,” says Priya Tew, a registered dietitian and founder of Dietitian UK. “If you don’t eat meat or dairy and you follow a vegan or vegetarian diet, you certainly need to be aware of the risk of a deficiency.”

Recent estimates from the National Institute for Health and Care Excellence (Nice) suggest that B12 deficiency affects 11 per cent of vegans. Older people are also more at risk. Overall, B12 deficiency affects about 6 per cent of people under 60, and 20 per cent of those over 60. 

“When we get older our appetites dwindle, so we may consume less food containing vitamin B12. We are also less able to absorb it effectively,” says nutritionist Rhiannon Lambert, author of The Science of Nutrition. “Older women may also be at a higher risk of a vitamin B12 deficiency due to their increased likelihood of getting the auto-immune condition pernicious anaemia, which causes your immune system to attack the cells in your stomach that produce the intrinsic factor – a protein that helps your intestines absorb vitamin B12.

“Other at-risk groups include those who have had abdominal or bowel surgery, and anyone who takes long-term antacid drugs for heartburn.”

However, if you eat meat, eggs and dairy, it’s likely you will still be getting your fair share of B12 and probably don’t need to worry. “If your absorption isn’t completely efficient, it’s likely to be less of a problem than if you’re vegan or a vegetarian to boot,” says Tew. “But it’s worth speaking to your doctor if you’re concerned about the amount of vitamin B12 in your diet, or your body’s ability to absorb it.” 

Early symptoms of a deficiency include tiredness, fatigue and mood changes. But if a vitamin B12 deficiency is left unchecked, things could get more serious. “Eventually, you can get a form of anaemia known as megaloblastic anaemia, which is different to the type caused by iron deficiency,” says Tew. “A B12 deficiency can also affect fertility and increase the risk of neural tube defects like spina bifida in babies during pregnancy.” In extreme cases vitamin B12 deficiency has also been linked to nerve damage and cardiovascular disease.

Fortunately, even if you’re vegan, or just prefer to eat less meat and dairy, there are still plenty of ways you can bolster your vitamin B12. “Breakfast cereals and plant milks, like almond and soya, are often fortified with B12 and, love it or hate it, Marmite is also high in vitamin B12. Nutritional yeast flakes fortified with vitamin B12 are another good way to up your intake. Simply sprinkle them over salads, pasta or rice.”

So how much do we need in our daily diet? The NHS recommends that adults aged 19 to 64 need about 1.5 micrograms a day of vitamin B12. (A microgram, mcg, is one thousandth of a milligram, mg).

“Sticking to this recommended daily intake of vitamin B12 can help improve your mood and energy,” says Tew, who suggests reading the information on your cereal box or plant milk packet to check the quantities.

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