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How to help your immune system help you

  • 08/09/2021
  • Physical Health

In the last eighteen months, we’ve been hearing more than usual about immunity.  The risk of COVID-19 has increased how much we think about our own resistance to disease.  Whilst a balanced immune system may not prevent us from catching viruses; it can minimise the effect that these viruses have on our bodies.   

The immune system is the bodily system that protects us from foreign substances, cells, and diseases by producing an immune response to fight invading cells. Our diet can play a huge role in naturally supporting our immune system and the health of our gut.  The key in all this is to have an immune system that is balanced, not weak and not too strong either.  Too much immune response is just as problematic as too little.  Here are a few ideas to help your immune system help you. 

Our gut and our immune system

Gut health is proven to strengthen the immune response to infection.  70% of our immune system is present in our gut and this is formed from an early age*.  If our gut bacteria is imbalanced, such as too much ?“bad” bacteria, this can confuse our immune system causing it to start attacking our own cells. While our immune system is busy reacting to healthy cells, not only is it easier for us to become ill but it’s also harder to heal and recover.  So how can we keep our gut microbiota balanced?

We can reduce practises which damage our friendly gut bacteria.  These include taking anti-biotics, eating high sugar foods, high red meat diet and excessive alcohol.  Instead we should encourage our ‘friendly’ bacteria by eating the right foods.  Gut-supporting foods are high in fibre, specific vegetables like garlic and onions (pre-biotics) and live, fermented foods, like kefir, kombucha and sauerkraut (pro-biotics).  Our fibre intake should be approaching 30g a day – which can be quite a challenge but it is possible.   It’s important to understand a little more about fibre.  There are two types:

Soluble fibre:

Foods high in soluble fibre (soluble in water) help to lower ‘bad’ cholesterol by reducing the amount of cholesterol that is absorbed into the bloodstream from our intestine.

Insoluble fibre:

Insoluble fibre does not dissolve in water and is undigested by the body. For this reason, it helps to keep the gut moving and promote regular bowel movements. This is one of the reasons it has been linked with reducing both constipation and the risk of bowel cancer. 

Here are some food sources of both types of fibre.  Try to eat both in your daily diet. 

TypeMajor food sourcesExamplesPhysiological effects
Soluble fibreFruits, vegetables, some cereals and beans Apples, bananas, citrus fruits, carrots, barley, oats and kidney beansDelays gastric emptying, slows down glucose absorption and can lower blood cholesterol
Insoluble fibreAll plants, wheat, rye, fruit and vegetablesWheat products and brown riceIncrease faecal bulk and decrease transit time

 

And here’s a table of foods to give you an idea where you might get your fibre from:

FoodGrams of fibreFoodGrams of fibre
Chia seeds per 100g34.51 half large avocado5
Av. portion baked beans141 medium apple with skin4.5
Almonds per 100g12.51 medium potato with skin4
Oats per 100g10.61 cup of strawberries3
Lentils per 100g7.91 medium banana2.6
Chickpeas per 100g7.61 portion of spinach2
Raspberries per 100g6.61 medium carrot1.5
1 medium pear with skin5.51 slice of brown bread1

 

Focus on plants and eat the rainbow

In principle, the more plant-based your diet, the more you will improve your immune system. Fruits and vegetables are full of micronutrients which play a vital part in keeping our immune system (and our whole bodies) healthy.

Together with antioxidants and zinc, Vitamin C is also key and because we do not make or store it, our diet is crucial to providing enough Vitamin C for our immune system to function properly. Try to eat high Vitamin C foods as raw as possible, since high heat can destroy this precious vitamin. Selenium (Brazil nuts are a high provider) has also recently been linked to improving our resistance to infection.

Immune supporting shopping list

Here are a dozen fantastic immune supporting foods:

  1. Red peppers - ounce for ounce more Vitamin C than citrus fruits.
  2. All citrus fruits and kiwis for Vitamin C and production of white blood cells.
  3. Broccoli – contains Vitamin A, C & E and antioxidants.
  4. Garlic - heavy concentration of sulphur-containing compounds which can support the immune system.
  5. Ginger – a naturally anti-inflammatory food.
  6. Spinach - rich in Vitamin C, antioxidants and beta-carotene which may increase infection fighting ability.
  7. Live yogurt can stimulate the gut, as well as provide Vitamin D.
  8. Almonds – contain Vitamin E, also key to a healthy immune system.
  9. Turmeric - an anti-inflammatory spice with much trendy comment.
  10. Green tea - contains the antioxidant EGCG which can boost immune function.
  11. Sunflower seeds - full of minerals and particularly Vitamin E and all its powerful antioxidant properties.
  12. Shellfish - packed with zinc, this mineral is essential for our immune cell function.


A diverse diet is a healthy diet!

Should I supplement?

We should also remember the value of Vitamin D in our fight against becoming ill. Research** shows that it has a vital part to play in reducing inflammation and disease. In the winter it's difficult to get sufficient Vitamin D, with sunlight less strong and less frequent. I'd recommend looking into taking a supplement to maintain your vitamin D levels, especially when sunlight levels are low.  Also consider how much light nutrition you are receiving.  Here’s a link to a podcast I recorded with Neina Sheldon from Light Matters. 

Mindful Meets - Ep 6 - Neina Sheldon FRSA - Why light matters! (buzzsprout.com)

Lifestyle contributors

Lastly if you look after yourself in a wider sense, you will also help your immune system function better.  Try to keep your stress levels managed, hydrate yourself and get plenty of sleep. All the usual self-care principles will help keep your immune system healthy.

Hope you can take these positive steps to keep yourself protected all year round.

  

Lori Weber

The Mindful Eating Clinic

Eating therapy, weight management and nutrition advice

www.themindfuleatingclinic.com

 


 

References

**Cynthia Aranow, MD. Vitamin D and the Immune System. March 2, 2011

*  Geuking MB, Köller Y, Rupp S, McCoy KD. The interplay between the gut microbiota and the immune system. Gut Microbes. 2014 May-Jun;5(3):411-8. doi: 10.4161/gmic.29330. Epub 2014 Jun 12. PMID: 24922519; PMCID: PMC4153781.


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