4 signs you may have a strong immune system

Key Points

• Your immune system is your body’s first line of defence.
• Good gut health contributes to a strong immune system.
• As you age, your immune system may not be as strong as it once was.

Your immune system is your body’s first line of defence against illnesses and infections. But how do you know if your immune system is doing its job effectively? In this article, we explore signs that may indicate you have a strong immune system and speak to Dietitian, Kate Agnew to help shed some light on this essential aspect of your overall health.

What are some strong immune system signs? 

1. Quick recovery from illness

A strong immune system may help your body to bounce back quickly when you fall ill. If you find yourself recovering from common colds, flu, or other infections faster than usual, it could be a sign of a strong immune response.

2. Minimal infections

If you rarely get sick or experience infections, it may indicate that your immune system is doing a good job of warding off potential threats.

3. Good gut health

Given that 70% of immune cells are found in the gut, good gut health may be a good indicator of a strong immune system. 

4. Adequate energy levels

If you consistently feel energised and alert, it could be thanks to your robust immune system.

Are allergies a sign of a strong immune system?  

“Not exactly,” shares Kate. “Allergies are the result of a hypersensitive immune system and “misguided response” to antigens in things like pollen, pet hair or food particles ingested.” Essentially, the body thinks these proteins are harmful and therefore initiates the immune system to respond – this could be in the form of coughing or a runny nose, or you may have a more serious response.

If you suspect allergies, speak to a healthcare professional to discuss your specific situation and options around allergen testing. 

Do some people have a naturally stronger immune system? 

“The immune system is complex,” Kate says. “There are certain non-modifiable factors that you cannot change that may lead you to have a naturally stronger immune system.” These factors include:

• Genetics
• Early nutrition
• Whether you were breastfed
• Early exposure to vaccines, antibiotics and other illnesses 
• The environment you grew up in 

Factors that you can control that help to support your immune system include things like eating a healthy diet, ensuring your vitamin intake is adequate, getting enough sleep and following a regular exercise routine. Certain supplements may also offer benefits, although more research is needed in some areas. 

Does the immune system weaken as we age?

“Yes,” shares Kate. “Ageing may result in reduced functioning of the immune system due to many reasons, such as inflammation and less efficient functioning of the body’s organs. This tends to take effect from age 60 onwards. Elderly people may also be at higher risk due to a potentially lowered response to vaccinations.”

A strong immune system: the cornerstone of good health

It’s wise to be aware of the factors that affect the immune system and follow a lifestyle that supports it. If you have concerns about your immune system or specific health conditions, make sure you consult with a healthcare professional. 

Related:

• 15 foods that may help support your immune system
• What is your immune system and how does it work?
• What are the best vitamins for tiredness and lack of energy?

Kate Agnew is an Accredited Practising Dietitian who is passionate about innovation and problem-solving in health & nutrition. Her goal is to ultimately create a healthier environment for all Australians.

Reviewed by Healthylife health experts October 2023