Flu jabs are considered the best protection against an unpredictable virus that can cause unpleasant symptoms and severe illness in at-risk groups. But nutrition also plays a critical role in staying healthy all-year-round.

Many experts agree that one of the reasons for this is that we now spend more time indoors and being in closer proximity to people makes it easier for germs to spread.

There is also evidence to suggest that being cold makes our immune system less able to fight infection, so its incredibly important that we boost our immunity during the cold winter months.

Susceptibility to infection and illness is the primary symptom of a poor immune system and a person with weakened immunity is at an increased risk of experiencing more severe infections, which are harder to treat.

Some other signs to look out for include; fatigue, digestive difficulties and joint pain.

DON'T MISS

Dr Braude said its long been known the sunshine vitamin, vitamin D helps to protect our bones, but its not becoming well-recognised as an essential vitamin for the immune system too.

She added: An analysis carried out at Queen Mary University London, found that vitamin D helps to reduce the risk of respiratory infections, including colds and flu especially amongst people who dont get enough vitamin D from exposure to sunlight, or from their diets.

Studies have also found that the vitamin is crucial for our immunity to fight off coughs, colds and flu, once we are already infected.

Vitamin D deficiency is most prevalent during the peak of cold and flu season and there is evidence to support the use of supplementation which can help to reduce both the incidence and severity of cold and flu symptoms.

Dr Braude said: A recent research review claims that vitamin D is more effective than the flu vaccine.

The evidence, which spans at least a decade, found that for those with the most significant vitamin D deficiencies (blood levels below 10 nmol/L), taking a supplement cut their risk of respiratory infection in half.

Additionally, people who took a daily or weekly vitamin D supplement, were less likely to report acute respiratory infections like influenza or the common cold than those who did not.

If you succumb to winter bugs regularly, Dr Braudes advice is to eat a colourful, varied diet filled with fresh whole-food ingredients, instead of highly processed packaged foods.

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Flu jab: Are vitamin D supplements more effective than the flu vaccine? - Express