Inflammation
Inflammation is the immune system's biological response to injury, infection, or irritation. It serves as a protective mechanism designed to remove harmful stimuli, including damaged cells or pathogens, and begin the healing process. While it is often viewed negatively, inflammation is actually a vital part of your body's defence; without it, simple infections could become deadly and wounds would never heal.
The Two Types: Acute vs. Chronic
It is crucial to distinguish between the two distinct forms of inflammation, as one heals you while the other can silently harm you. The medical community categorises them based on speed of onset and duration.
| Feature | Acute Inflammation | Chronic Inflammation |
|---|---|---|
| Purpose | Immediate response to heal sudden damage (e.g., a cut or flu). | Long-term response to lingering threats or lifestyle factors. |
| Duration | Short-term; lasts days to weeks. | Long-term; can last months or years. |
| Visible Signs | Redness, heat, swelling, and pain. | Often invisible; fatigue, body aches, digestive issues. |
| Outcome | Tissue repair and healing. | Tissue damage and increased disease risk. |
Why Chronic Inflammation Is a Silent Killer
Chronic inflammation occurs when the immune system gets confused or cannot eliminate the threat, leaving the body in a permanent state of high alert. Over time, this constant immune activity damages healthy tissues, organs, and DNA.
In the UK, chronic inflammatory diseases are the most significant cause of death, contributing to conditions such as [1]:
- Cardiovascular Disease: Inflammation can damage blood vessels and promote plaque buildup [2].
- Type 2 Diabetes: Inflammatory cytokines interfere with insulin signalling [3][4].
- Autoimmune Disorders: Conditions like Rheumatoid Arthritis occur when the body attacks its own joints [5][6].
Common Causes and Triggers
Chronic inflammation is rarely caused by a single factor but is usually the result of cumulative lifestyle and environmental stressors [7].
Dietary Choices
What you eat directly signals your immune system. Diets high in ultra-processed foods, refined sugars, and unhealthy fats (trans fats) stimulate the production of pro-inflammatory markers like C-reactive protein (CRP) [8][9].
Environmental Toxins
Long-term exposure to pollutants, such as cigarette smoke or urban air pollution, forces the immune system to constantly fight off foreign particles [10][11].
Chronic Stress
Psychological stress triggers the release of cortisol. While cortisol is anti-inflammatory in short bursts, chronic stress leads to "cortisol resistance," where the immune system stops listening to the "off" signal and inflammation runs rampant [12].
Managing Inflammation Through Diet
The most effective way to lower systemic inflammation is through an anti-inflammatory diet, which focuses on whole, unprocessed foods rich in antioxidants.
- Fatty Fish: Salmon, mackerel, and sardines are rich in Omega-3 fatty acids, which inhibit the production of substances that trigger inflammation.
- Berries: Strawberries, blueberries, and raspberries contain anthocyanins, powerful antioxidants that support immune health.
- Leafy Greens: Spinach and kale are high in Vitamin K and antioxidants.
- Spices: Turmeric (containing curcumin) and ginger have been shown to block specific inflammatory pathways.
Nutritionist's Corner: Final Thoughts
"Think of inflammation like a fire alarm. Acute inflammation is the alarm going off when there is actual smoke, bringing the fire brigade (white blood cells) to save the day. Chronic inflammation is like a faulty alarm that rings quietly in the background for years, it exhausts the fire brigade and eventually causes water damage to the building. To turn off this false alarm, focus on 'cooling' foods. I recommend adding just one anti-inflammatory food to every meal, such as a handful of walnuts on your porridge or a sprinkle of turmeric in your rice."
- Yusra Serdaroglu Aydin, MSc RD
Sources
[1] Exercise, lifestyle activity and immune-mediated chronic inflammation - Loughborough University
[2] Inflammation: what is it, and how does it affect the heart? - British Heart Foundation
[5] Rheumatoid arthritis - Causes - NHS
[6] Rheumatoid arthritis - WHO
[10] Ural, B.B., Caron, D.P., Dogra, P. et al. Inhaled particulate accumulation with age impairs immune function and architecture in human lung lymph nodes. Nat Med 28, 2622–2632 (2022). https://doi.org/10.1038/s41591-022-02073-x
[11] Glencross, D. A., Ho, T. R., Camiña, N., Hawrylowicz, C. M., & Pfeffer, P. E. (2020). Air pollution and its effects on the immune system. Free Radical Biology and Medicine, 151, 56-68. https://doi.org/10.1016/j.freeradbiomed.2020.01.179
Author
Yusra Serdaroglu Aydin, MSc RD
Head of Nutrition and Registered Dietitian
Yusra is a registered dietitian with a multidisciplinary background in nutrition, food engineering, and culinary arts. During her education, her curio...