When the mornings get darker, the days become colder, and coats and boots slowly starting to re-appear in our wardrobes and shops, it’s probably time we start preparing ourselves for our winter colds, too.
We are naturally more susceptible to colds during the winter, but there are ways to fight back. While “boosting your immune system” is an inaccurate phrase, looking after your immunity is still important. According to Dr Sarah Brewer, a GP and the medical director of vitamin and supplement brand Health-span, a strong immune system is the key to staying healthy no matter what the elements throw our way. The immune system “protects against disease by recognizing and attacking infections,” she explains.
It functions in two ways: ‘innate’ immunity (protections that are programmed into all of us as general defenses against disease) and ‘acquired’ immunity (specific measures in the body aimed against a particular infection once we have encountered it for long-term immunity – how vaccines work).
What are the signs of a low immune system?
A ‘low’ immune system simply means that you are more likely to experience symptoms when exposed to a common cold virus or bacteria. So, the most common sign that your immunity is low is that you have frequent or prolonged colds
Why is my immune system low?
There are many reasons why someone might have lower than usual immunity. Dr Brewer says that “one theory is, as people get older, they develop more vitamin and mineral deficiencies that contribute to reduced immunity with higher levels of inflammation”. She points to a recent study from Oregon State University which found that people aged 55 and over who took a daily multivitamin and mineral supplement for 12 weeks were able to fight off infections twice as fast as those taking a placebo.
But it’s about more than just nutrition. Have you ever noticed that you get wiped out with a cold just before a job interview or big event? That’s because stress has a huge impact on our immunity, says Dr Brewer: “Numerous studies have demonstrated that long term stress has the ability to reduce the functionality of key components of the immune system which can, in turn, leave you open to infection.”
And you’re also not imagining that you get more unwell in the winter than the summer. That’s because viruses can survive longer outside the body when temperatures are reduced. “Inhaling cold air reduces immune responses within the nasal lining and a lack of sunshine lowers your levels of vitamin D, which also impairs immunity,” says Dr Brewer.
Post-Covid cold’s are also expected to soar. That’s because, for the first time in a long time, we’re all inside again. Whether it’s offices or restaurants, being around each other for the first time in a long time does mean that infections will spread.
How can I support my immune system?
Getting in the right nutrients is essential for optimum functioning of the body – including the immune system. Vitamin D and vitamin C are what to focus on: research by the World Health Organisation has shown that taking vitamin D supplements can reduce your risk of experiencing at least one respiratory infection, including the common cold, influenza or pneumonia, by a third. Other studies show that vitamin C suppresses the activation of viral genes so that cold viruses cannot survive in cells.
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While the NHS recommends taking a vitamin D supplement, especially during the winter months, we should also try to focus on “eating a Mediterranean style diet with plenty of fruit and vegetables, onions, garlic, oily fish and whole grains” to ensure that we are giving our immune systems the nutrients it needs to function, says Dr Brewer.
Other lifestyle tweaks you can make to support your immunity include exercise, which can neutralize the harmful effects of stress hormones. “Exercise should be non-competitive, so avoid over-training and marathons [to support immunity] as physical stress suppresses immunity and increases the risk of developing symptoms when exposed to a common cold virus,” Dr Brewer advises.
And get some sleep! “During sleep, your body secretes hormones involved in fighting disease. People who sleep for seven to eight hours have better immunity than those who are sleep deprived, and tend to live longer, too.”
Then there are natural supplements you can take. “I always keep some Pelargonium extracts on hand to start as soon as cold or flu symptoms develop,” says Dr Brewer. This is a traditional herbal remedy from a South African geranium, and clinical trials show that it is effective in treating acute bronchitis, sinusitis, tonsillitis and the common cold.
Echinacea, another licensed herbal medicine, is also a popular cold-beater. “It has a natural, antimicrobial action, increases the number and activity of white blood cells involved in fighting infections, and has an anti-inflammatory action to reduce symptoms if an infection takes hold,” explains Dr Brewer. Echinacea has actually been shown to reduce the chance of developing a cold by 58% and shorten the duration of those that do occur by 1.4 days.
And, at risk of sounding like Boris Johnson, washing your hands is essential, as is wiping down keyboards, doorknobs and phones. Be alert to the key symptoms of coronavirus, and take lateral flow tests regularly to ensure that your sickness isn’t the virus.