Inflammaging is a chronic, low-grade, systemic inflammatory state that tends to develop with advancing age, genuinely distinct from the acute, short-term inflammation the body produces in response to an injury or infection. It's recognized as one of the hallmarks of aging, and one of the few with a direct bearing on longevity that you can actually track, and unlike some other hallmarks, it has several trackable real-world markers worth understanding together rather than in isolation.
- Chronic, low-grade inflammation, distinct from acute injury or infection response.
- hs-CRP is the primary direct tracked marker of systemic inflammation.
- Homocysteine and declining Vitamin D3 also tend to trend unfavorably with age.
- Exercise, sleep, and diet quality are all associated with lower chronic inflammatory markers.
One direct marker, and two worth reviewing alongside it
hs-CRP is the direct marker. High-sensitivity C-reactive protein is produced by the liver in response to inflammatory signalling throughout the body, and it is the one measure here that reads systemic inflammation itself. Widely used clinical thresholds put low cardiovascular risk below 1.0 mg/L, average risk between 1.0 and 3.0, and high risk above 3.0, covered in full on the hs-CRP entry.
Two other markers are tracked alongside it, for different reasons, and it is worth being precise that neither is a marker of inflammation.
Homocysteine is an observational risk signal. Trials lowering it with B vitamins did not improve cognitive outcomes, which is the distinction the dementia prevention entry is built around. Read the association there rather than treating it as an inflammation reading here.
Vitamin D3 is a nutrient status measure that declines with age, partly through reduced skin synthesis efficiency, and has associations with immune regulation. It is not a marker of chronic inflammation, and calling it one would overstate what it measures.
The gap between its observational and trial evidence is worth knowing. Large randomised trials of vitamin D supplementation have not shown the cardiovascular and cancer benefits the observational associations suggested, a pattern the vitamin D entry covers.
What actually drives the inflammatory drift
Inflammaging isn’t a single process with a single cause. It is the net result of several mechanisms that push inflammatory signalling upward while the systems that would normally resolve it become less effective. Understanding the sources explains why some interventions work and others don’t.
- Senescent cells and their secretions. Cells that have stopped dividing but not died accumulate in tissue and secrete a mixture of inflammatory cytokines, known as the senescence-associated secretory phenotype. This is the mechanism senolytics are designed to interrupt, and the most direct link between the hallmarks of aging and a marker you can measure.
- Visceral fat as an endocrine organ. Visceral adipose tissue actively secretes inflammatory signals including IL-6 and TNF-alpha. This is the largest modifiable contributor for most people, and the reason waist measurement carries information that bodyweight doesn’t.
- Intestinal permeability. Age-related changes in the gut barrier allow bacterial components, notably lipopolysaccharide, to reach circulation in greater quantities, producing persistent low-level immune activation. This is one route by which gut microbiome composition connects to systemic inflammation.
- Chronic viral load. Lifelong infections, cytomegalovirus in particular, occupy a growing share of immune resources over decades. This contributes to immunosenescence: an immune system simultaneously more inflamed and less effective at responding to new threats.
- Declining resolution. Acute inflammation is meant to end through an active process using specialised molecules. That resolution machinery becomes less efficient with age, so episodes that should close cleanly instead leave a residue.
Why the sources matter for what you do
These contributions aren’t equally modifiable, and that asymmetry should drive priorities. Chronic viral load is essentially fixed. Declining resolution isn’t yet directly addressable. Visceral fat and gut barrier function respond to fat loss, fiber intake and regular exercise, which is why those interventions show up in the evidence while anti-inflammatory supplements largely don’t.
It also explains the shape of the marker. hs-CRP integrates all of these sources at once, which makes it a good summary and a poor diagnostic: an elevated reading tells you the total is high without telling you which contributor is responsible.
The three markers, side by side
| Marker | What it is | What moves it | How fast it responds |
|---|---|---|---|
| hs-CRP | Direct systemic inflammation signal | Fat loss, regular exercise, sleep, smoking cessation | Weeks to months, and transiently within days of illness or a hard session |
| Homocysteine | Observational risk signal, not an inflammation measure | B vitamin status, folate, B12 | Weeks, though lowering it has not improved cognitive outcomes in trials |
| Vitamin D3 | Nutrient status, not an inflammation measure | Sun exposure, supplementation, latitude and season | Weeks to a few months |
Making it measurable
The usual framing mentions inflammaging as an abstract concept without connecting it to markers you can monitor. Three of them are trackable in ordinary bloodwork.
Review hs-CRP, homocysteine and vitamin D together rather than in isolation, since they reflect an overlapping picture. One in range says little about the other two.
Regular aerobic and resistance training, adequate sleep and a diet high in fibre and polyphenols are the levers with evidence behind them. There is no supplement that substitutes for those.
The app tracks all three of these markers together, a concrete picture rather than an abstraction.
Sources
Key references for the claims on this page. Where a figure is attributed to a specific study or body, it is named here.
- Franceschi C, Bonafè M, Valensin S, et al. Inflamm-aging: an evolutionary perspective on immunosenescence. Annals of the New York Academy of Sciences, 2000;908:244–254. The origin of the term. PMID 10911963
- Furman D, Campisi J, Verdin E, et al. Chronic inflammation in the etiology of disease across the life span. Nature Medicine, 2019;25(12):1822–1832. DOI
- Coppé JP, Desprez PY, Krtolica A, Campisi J. The senescence-associated secretory phenotype: the dark side of tumor suppression. Annual Review of Pathology, 2010;5:99–118. The SASP mechanism described in the first driver. DOI
- López-Otín C, Blasco MA, Partridge L, Serrano M, Kroemer G. Hallmarks of aging: an expanding universe. Cell, 2023;186(2):243–278. Chronic inflammation as one of the twelve hallmarks. DOI
- Fontana L, Eagon JC, Trujillo ME, et al. Visceral fat adipokine secretion is associated with systemic inflammation in obese humans. Diabetes, 2007;56(4):1010–1013. The second driver. PMID 17287468
- Kim KA, Jeong JJ, Yoo SY, Kim DH. Gut microbiota lipopolysaccharide accelerates inflamm-aging in mice. BMC Microbiology, 2016;16:9. The intestinal permeability and lipopolysaccharide driver. DOI
- Bajaj V, Gadi N, Spihlman AP, et al. Aging, immunity, and COVID-19: how age influences the host immune response to coronavirus infections? Frontiers in Immunology, 2021;12:571416. Cytomegalovirus driving oligoclonal memory T-cell expansion and continuous low-level cytokine production. DOI
Frequently asked
What is inflammaging?
Chronic, low-grade systemic inflammation that tends to develop with age, distinct from acute injury response.
Which tracked markers reflect it?
hs-CRP directly, plus homocysteine and declining Vitamin D3, which also trend unfavorably with age.
Can it be reduced?
Yes, exercise, adequate sleep, and a whole-food, fiber-rich diet are all associated with lower chronic inflammation.
Is all inflammation bad?
No, and this is the distinction that gets lost. Acute inflammation is how you heal a wound or clear an infection, and blunting it indiscriminately would be a bad idea. Inflammaging refers to a low-grade, persistent elevation with no infection to resolve, which is a different phenomenon.
What else raises hs-CRP besides aging?
A recent infection, an injury, a hard training session in the previous day or two, higher body fat, smoking, and poor sleep will all move it. This is why a single elevated reading means little on its own, and why testing shortly after illness or a heavy workout produces a misleading number.
Can diet lower it?
Modestly. The clearest signals come from reducing excess body fat, raising fiber intake, and improving overall diet quality rather than from any single food. Effects are real but small relative to what regular exercise and fat loss achieve together, and slower to appear than most marketing implies.
Is there a target level?
Widely used clinical thresholds put low cardiovascular risk at the bottom of the range, with progressively higher categories above it. The specific cut-offs are covered in the hs-CRP entry. Chasing the lowest possible number isn’t the goal, since very low readings carry their own interpretive difficulties.
Does inflammaging cause age-related disease, or just accompany it?
Probably both, running in each direction. Chronic inflammation contributes to processes like atherosclerosis, and those conditions in turn sustain inflammation. Untangling which came first in any individual isn’t currently possible, and claims that it is the root cause of aging overstate the evidence.