"To protect yourself against colds and flu, the most important thing you can do is to build a healthy immune system." Dr Russell Blaylock, author of Dr Blaylock's Prescriptions for Natural Health.

Most people only notice their immune system when they come down with a cold or flu.

Yet every day your immune system is performing an extraordinary task: identifying viruses, launching defensive responses, and coordinating thousands of immune cells to eliminate threats.

When a virus enters the body, immune cells recognise it as an invader and trigger a coordinated response. White blood cells attack infected cells, chemical signals recruit reinforcements from the immune system, and the body works to neutralise and clear the infection.

Symptoms such as fatigue, fever, congestion and body aches are not simply signs of illness. They are often evidence that the immune system is actively doing its job.

The encouraging reality is this: when we give the body the right conditions, the immune system is remarkably effective at restoring health.

Why Viral Illness Can Hit Harder in Midlife

Many people notice that viral infections feel different in their 50s or 60s compared with earlier decades.

Several biological factors contribute to this:

Immune response gradually changes with age

The production and activity of certain immune cells becomes less efficient over time, which can make it harder for the body to eliminate viruses quickly.

Inflammation tends to increase with age

Low-grade inflammation can weaken immune defences and make symptoms more intense when infection occurs.

Recovery processes slow down

Cell repair, hormone balance, and metabolic recovery can take longer, which means fatigue and other symptoms may linger.

Stress, sleep disruption, and nutrient deficiencies become more common

These factors can reduce immune resilience and increase vulnerability to infections.

This does not mean that illness is inevitable or that recovery has to be prolonged. The immune system remains highly responsive when supported with the right lifestyle inputs.

When a virus strikes, the goal is to create the conditions that allow the immune system to work efficiently.

5 Practical Ways to Support Your Immune System

If you do catch a virus such as a cold or flu, there are several practical ways you can support your immune system so your body can recover more efficiently.

1. Prioritise Rest and Quality Sleep

When the body is fighting a virus, the immune system needs energy to do its job. Sleep plays a vital role in this process by increasing infection-fighting immune cells, supporting antibody production, regulating inflammation and allowing the body to repair.

Research consistently shows that people who sleep less than six hours per night are significantly more likely to develop infections when exposed to viruses.

When illness strikes, resisting the urge to “push through” can make a real difference to recovery time.

Practical ways to support recovery

• Go to bed earlier for several nights

• Take short daytime naps if fatigue is high

• Reduce demanding physical or cognitive activity

• Stay well hydrated

Rest gives the immune system the energy it needs to fight the infection effectively.

2. Watch or Listen to Something That Makes You Laugh

When you are feeling unwell, it is easy to focus entirely on symptoms and discomfort. But one surprisingly helpful way to support recovery is to intentionally create moments of laughter.

Laughter has measurable physiological effects that benefit the immune system and it doesn’t require anything complicated. Simple activities can create the same effect:

• Watching a favourite comedy programme or film

• Listening to a humorous podcast

• Reading something that makes you laugh

• Calling a friend who lifts your mood

These moments may seem small, but they send a powerful signal to the body that it is safe to relax. That shift can help regulate stress hormones and support the immune response.

When you’re recovering from illness, creating space for a bit of laughter can help your body return to full strength more quickly.

3. Eat Foods That Actively Support Immune Defence

Food provides the raw materials the immune system relies on to function well.

Certain foods contain compounds that help the body fight viruses and regulate inflammation.

Examples include:

Garlic

Contains allicin and other sulfur compounds with antiviral and immune-supporting properties.

Ginger

Contains compounds like gingerol and shogaol, which have potent anti-inflammatory and antiviral properties that are especially effective against respiratory viruses.

Green tea

Packed with epigallocatechin gallate (EGCG), a powerful antioxidant and polyphenol that inhibits viral replication for a wide range of viruses, including colds and flu.

Citrus fruits

Rich in vitamin C and antioxidants that increase white blood cell production and protect immune cells from oxidative stress.

Berries

High in polyphenols and antioxidants, which have antiviral and antimicrobial properties that protect the respiratory tract.

Manuka honey

Stimulating the immune system, improving the body's natural defense against both viruses and bacteria.

Leafy greens

Provide vitamins A, C and folate, which play key roles in immune function.

Mushrooms

Contain beta-glucans that can help activate immune cells.

Turmeric

Contains curcumin, which has strong antiviral and anti-inflammatory properties, helps regulate immune cells, and boosts antibody responses.

When appetite is reduced during illness, simple nutrient-dense meals can still provide valuable support.

A useful rule is to focus on whole, minimally processed foods that provide vitamins, minerals and antioxidants.

4. Support Gut Health With Probiotic Foods

One of the most overlooked aspects of immunity is the health of the gut microbiome.

Around 70% of the immune system is associated with the gut, and when the balance of gut bacteria is disrupted, immune function can be weakened.

Probiotic foods help replenish beneficial bacteria and support a healthier microbiome.

Examples include*:

• Sauerkraut

• Kimchi

• Miso

These foods introduce beneficial microbes that can strengthen immune defences and help regulate inflammation.

Just a small amount each day can help support gut health.

Prebiotic foods - which feed beneficial bacteria - are also valuable. These include:

• Onions

• Leeks

• Garlic

• Asparagus

• Apples

• Beans

Maintaining a healthy microbiome gives the immune system stronger foundations.

5. Use Key Supplements That Support Immune Function

While a balanced diet provides many nutrients, certain supplements can provide additional support when the body is fighting an infection.

Two of the most important are vitamin C and vitamin D.

Vitamin C

Vitamin C plays multiple roles in immune defence:

• Supports white blood cell activity

• Helps protect cells from oxidative damage

• Assists the body in clearing infections

During illness, the body uses vitamin C rapidly, which is why many people increase their intake when they feel a virus developing.

Vitamin D

Vitamin D functions like a hormone that regulates immune responses throughout the body.

Low vitamin D levels are associated with increased susceptibility to infections and poorer immune regulation.

Because sunlight exposure is limited during winter in many northern countries, supplementation is often necessary during colder months.

Before taking higher doses, it is advisable to check vitamin D levels with a healthcare professional.

Supporting Your Body Speeds Recovery

When a virus strikes, your immune system is already working hard to restore you back to health.

The most helpful thing you can do is give your body the conditions it needs to do that job well - prioritising rest, nourishing foods, a healthy gut and the nutrients that support immune function.

These simple choices can help your body recover more efficiently and return you quickly to full strength.

*While dairy-based yoghurt and kefir are also beneficial for gut health, many people notice that symptoms such as nasal congestion and coughing feel worse when they consume dairy products during a viral illness. This does not mean dairy must be avoided permanently, but reducing it temporarily while you are ill can sometimes make symptoms easier to manage.

Disclaimer: While the foods suggested in this article support the immune system and have antiviral properties, they should not replace conventional medical treatments for serious infections.