Inflammation is usually thought of as something that happens to an injury: swelling, redness, heat, then healing. That’s acute inflammation, and it’s essential. Chronic inflammation is different. It’s a low-grade, body-wide activation of the immune system that never fully switches off, and it rises steadily with age in most men. Researchers have a name for it, “inflammaging,” and a growing body of evidence links it to nearly every major disease of later life: heart disease, type 2 diabetes, cancer, Alzheimer’s, sarcopenia, and frailty. It is, in a real sense, one of the common pathways through which ageing does its damage.
This guide explains what chronic inflammation is, why it rises with age, how it accelerates the diseases men die from, how to tell if yours is elevated, and the interventions with real evidence behind them.
What “Inflammaging” Is
Acute inflammation is a targeted, short-lived response to injury or infection. Chronic low-grade inflammation is a persistent elevation of inflammatory signalling molecules, particularly interleukin-6 (IL-6), tumour necrosis factor-alpha (TNF-α), and C-reactive protein (CRP), in the absence of any obvious injury or infection. The levels are far below those of an acute infection, but they’re continuous, and over years the cumulative effect on tissues is substantial.
The term inflammaging was coined in 2000 to describe the observation that this baseline inflammatory tone rises with age even in otherwise healthy people, and that it predicts mortality and disease independently of other risk factors. It’s now considered one of the core hallmarks of biological ageing, and a key reason why biological age can diverge so sharply from chronological age.
Why Inflammation Rises With Age
Senescent cells. As cells age and stop dividing, some enter a “senescent” state in which they don’t die but secrete a cocktail of inflammatory molecules. These accumulate in tissues over decades, acting like a slow inflammatory leak.
Visceral fat. Fat stored around the abdominal organs is metabolically active and pumps out inflammatory cytokines. This is one of the main reasons visceral fat is so much more dangerous than fat under the skin, and why waist size tracks so closely with inflammatory markers.
Gut barrier decline. With age, the gut lining becomes more permeable, allowing bacterial fragments into circulation where they trigger immune activation. Gut health and inflammation are tightly linked. Diet does more for your gut than a probiotic pill (see do probiotics work).
Immune system ageing. The immune system becomes less precise with age, mounting weaker responses to real threats and more background activity when there are none.
Lifestyle drivers. Poor sleep, chronic stress, physical inactivity, smoking, excess alcohol, and diets high in refined carbohydrates and ultra-processed food all raise inflammatory markers. These are the modifiable part.
How Chronic Inflammation Drives Disease
| Condition | Role of chronic inflammation |
|---|---|
| Cardiovascular disease | Drives plaque formation and instability in arteries; CRP predicts heart attack risk independently of cholesterol |
| Type 2 diabetes | Inflammatory cytokines directly impair insulin signalling in muscle and liver |
| Sarcopenia | IL-6 and TNF-α accelerate muscle protein breakdown and blunt muscle building |
| Cognitive decline | Neuroinflammation is implicated in Alzheimer’s and vascular dementia |
| Cancer | Chronic inflammation promotes DNA damage, cell proliferation, and tumour growth |
| Depression | Elevated inflammatory markers are consistently found in a subset of depression |
The cardiovascular link is the best established. Large trials have shown that lowering inflammation, even without changing cholesterol, reduces cardiovascular events, which settled the question of whether inflammation is a cause or merely a marker. It’s a cause.
How to Tell If Yours Is Elevated
The most accessible marker is high-sensitivity C-reactive protein (hs-CRP), a standard blood test. Values under 1 mg/L are considered low risk, 1 to 3 mg/L average, and above 3 mg/L elevated. It’s worth adding to a routine blood panel, particularly if you carry weight around the middle, have a family history of heart disease, or have other metabolic risk factors. Note that CRP spikes with any acute illness or injury, so a single high reading during or shortly after being unwell means little.
Beyond blood tests, the practical proxies are also the obvious ones: a growing waist, poor sleep, persistent fatigue, and slow recovery from training are all associated with higher inflammatory tone.
What Lowers Chronic Inflammation
Lose visceral fat. This is the single largest lever for most men. Reducing waist circumference measurably lowers CRP and IL-6. Our guide to losing belly fat after 40 covers how.
Exercise regularly. Both resistance training and aerobic exercise lower chronic inflammation, partly through fat loss and partly because contracting muscle releases anti-inflammatory myokines. This is one of the mechanisms behind the link between muscle mass and longevity.
Sleep seven to eight hours. Short sleep raises CRP and IL-6 within days. Sleep and longevity are connected substantially through this pathway.
Eat a mostly whole-food diet. Mediterranean-style eating, high in vegetables, fish, olive oil, nuts, and fibre and low in refined carbohydrates and ultra-processed food, consistently lowers inflammatory markers. Excess sugar and alcohol both raise them.
Manage chronic stress. Sustained cortisol elevation dysregulates immune function and promotes inflammation. Stress management is not optional for inflammatory health.
Don’t smoke; limit alcohol. Both are potent inflammatory drivers.
Supplements: modest evidence at best. Omega-3 fish oil has reasonable evidence for lowering inflammatory markers; curcumin and vitamin D have weaker, mixed evidence. None substitutes for the lifestyle changes above.
FAQ: Chronic Inflammation and Aging
Some quick answers on chronic inflammation and aging:
What is inflammaging?
The chronic, low-grade rise in inflammatory signalling that occurs with age, even in healthy people. It’s also considered a core hallmark of ageing and predicts disease and mortality independently of other risk factors.
What are the symptoms of chronic inflammation?
Often none directly. However, persistent fatigue, slow recovery, joint stiffness, and a growing waist are associated signs. The reliable measure is an hs-CRP blood test.
What’s a normal CRP level?
Under 1 mg/L is low risk, 1 to 3 mg/L average, above 3 mg/L elevated. Readings during or just after illness or injury are not representative.
What’s the best anti-inflammatory diet?
A Mediterranean-style pattern has the strongest evidence: vegetables, fish, olive oil, nuts, legumes, and fibre, with limited refined carbohydrates, sugar, and ultra-processed food.
The Bottom Line on Chronic Inflammation and Aging
The bottom line on chronic inflammation and aging: Low-grade, persistent inflammation rises with age and acts as a common pathway to heart disease, diabetes, muscle loss, cognitive decline, and cancer. It’s driven by senescent cells, visceral fat, gut changes, and immune ageing, but also substantially by sleep, stress, diet, and inactivity, which are within your control. An hs-CRP test tells you where you stand. The most effective responses are the unglamorous ones: lose visceral fat, train regularly, sleep well, eat mostly whole foods, and manage stress. Supplements play a minor supporting role at best.
This article is for informational purposes only and does not constitute medical advice. Consult a qualified healthcare professional for testing and interpretation of inflammatory markers.
Sources
- Harvard Health Publishing on acute versus chronic inflammation.
- Ferrucci L et al. Inflammageing: chronic inflammation in ageing, cardiovascular disease, and frailty. Nat Rev Cardiol, 2018
- Franceschi C et al. Inflammaging: a new immune-metabolic viewpoint for age-related diseases. Nat Rev Endocrinol, 2018
- CANTOS trial, NEJM 2017: anti-inflammatory therapy and cardiovascular events.
- Emerging Risk Factors Collaboration. C-reactive protein concentration and risk of coronary heart disease, stroke, and mortality: an individual participant meta-analysis. Lancet, 2010