Understanding CRP: A Marker of Chronic Inflammation

Most of us are familiar with inflammation as the redness and swelling that appears after a cut or an infection. That kind of inflammation is healthy and helpful.

But there is another kind of inflammation, one that simmers silently inside the body for years without any obvious symptoms. This quieter process may be one of the most important threats to our long-term health.

C-reactive protein (CRP) is one of the most accessible ways to detect this hidden inflammation. Produced by the liver in response to inflammatory signals in the body, CRP rises when something is stirring the immune system.

A standard blood test can measure CRP, while a more sensitive version called high-sensitivity CRP (hs-CRP) can detect much lower levels that would otherwise go unnoticed.

What Does a Raised CRP Actually Mean?

A single raised CRP result is not a diagnosis. Infections, injuries, and autoimmune conditions can all temporarily raise CRP.
What researchers and clinicians are increasingly paying attention to is a persistently mildly raised CRP, typically between 1 and 10 mg/L over months and years:

Higher risk of heart disease
Type 2 diabetes
Frailty and reduced resilience with ageing
Some forms of cancer

Studies of people who live exceptionally long and healthy lives into their nineties and beyond consistently find that they tend to maintain very low CRP levels throughout life. This suggests that keeping inflammation low may be a hallmark of healthy ageing.

How Visceral Fat Drives Chronic Inflammation and High CRP

One of the strongest drivers of long-term low-grade inflammation is not infection or disease. It is excess body fat, particularly fat stored deep in the abdomen around the internal organs.

This type of fat, known as visceral fat, is metabolically active and releases inflammatory chemical signals. These signals travel directly to the liver and stimulate the production of CRP.

This process is known as metainflammation, a term used to describe inflammation driven by excess nutrition and body fat rather than infection or injury.

At its core, metainflammation reflects the body's immune cells reacting to overloaded fat cells as though they were a threat. The encouraging news is that it is reversible.

Why Waist Circumference Matters

Waist circumference is often a better predictor of CRP levels than overall body weight.

In women, waist size alone explains approximately one-third of the variation in CRP levels across the population.

Waist Circumference Thresholds

	Men	Women
Western populations	94 cm	85 cm
East Asian populations	90 cm	80 cm

Raised CRP and Inflammation: Differences Between Men and Women

Men tend to accumulate more visceral fat overall, and the pathway linking abdominal fat to insulin resistance, heart disease, and metabolic syndrome is well established across the lifespan.

Women tend to show a stronger inflammatory response to visceral fat accumulation than men. They also experience a unique shift in their inflammatory status around the time of menopause.

Before menopause, oestrogen acts as a natural brake on inflammation by:

Calming the immune system
Encouraging fat storage in the hips and thighs rather than the abdomen
Reducing excessive inflammatory responses from the liver

When oestrogen levels decline:

Fat redistribution towards the abdomen becomes more common
Immune cells in fat tissue become more inflammatory
The liver becomes more sensitive to inflammatory signals
CRP may rise even without major weight gain

How to Lower CRP Levels?

Medical screening

Tracking hs-CRP over time, rather than as a one-off test, is a meaningful window into long-term inflammatory health.

hs-CRP Result Interpretation

Below 1mg/L: reassuring
1-3 mg/L: modest inflammatory activity
Persistently above 3 mg/L: warrants discussion with your doctor regarding possible causes and cardiovascular risk

Lifestyle changes

Practical ways to lower CRP:

Engage in regular aerobic exercise
Anti-inflammatory dietary patterns
Avoid smoking
Prioritise good sleep
Stress management
Monitor cardiovascular risk factors regularly

Looking Beyond the Scale

For people seeking a more precise assessment, a DEXA body composition scan can measure visceral fat, muscle mass, and total body fat. When combined with serial hs-CRP measurements, DEXA provides a practical way to monitor both the inflammatory signal and one of its major underlying drivers over time.

Key Takeaways

CRP is a marker of inflammation.
Persistently raised hs-CRP may indicate chronic low-grade inflammation.
Visceral fat is one of the strongest drivers of elevated CRP.
Waist circumference is often more informative than body weight alone.
Men and women can experience inflammation differently.
Exercise, weight loss, smoking cessation, sleep, and stress management can all reduce CRP.
Tracking CRP over time is usually more useful than a single result.
DEXA scanning can provide additional insight into visceral fat and metabolic health.

Dr Shiba Poon

General Practice, Family Medicine

LMCHK
MBBS (Lond)
DRCOG
DCH (RCPCH)
PGDipClinDerm (Lond)
MRCGP
Honorary Clinical Assistant Professor In Family Medicine (HKU)

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