"Chronic inflammation" has become the all-purpose explanation in wellness — for fatigue, low mood, brain fog, ageing, weight and almost everything else. That is a marketing frame.
Underneath it there is a real and genuinely interesting mechanism, with real trial evidence attached. The two are worth separating, because the science supports something much narrower and much more specific than the aisle does.
The mechanism, which is real
The brain has its own immune cells, microglia, and it is not immunologically sealed off from the rest of the body the way it was once thought to be. Inflammatory signalling molecules — cytokines such as IL-6, IL-1β and TNF-α — influence the brain through several routes, including vagal signalling and effects at the blood-brain barrier.
The clearest demonstration of this is something everyone has experienced. Sickness behaviour is the cluster you get with a bad flu: exhaustion, loss of interest in everything, social withdrawal, appetite change, difficulty concentrating, low mood. That is not you being miserable about being ill. It is a coordinated behavioural programme driven by inflammatory signalling, and it is conserved across species because conserving energy during infection is useful.
Now read that symptom list again. It overlaps substantially with depression. That observation is what launched the entire field, and it is a good observation.
What the evidence actually supports
Two things are reasonably well established.
A subset of people with depression have measurably raised inflammatory markers — CRP and IL-6 in particular. Not all. A subset. That heterogeneity is the interesting part and it's usually the part that gets dropped.
Inducing inflammation can induce depressive symptoms. Giving people interferon therapy, or an inflammatory challenge, reliably produces low mood and fatigue in a proportion of them. The direction of causation in that specific setting isn't in much doubt.
The treatment trials, with their problems
If inflammation contributes to depression, anti-inflammatory treatment should help. It has been tested extensively, and the honest summary requires both halves.
A systematic review and meta-analysis pooled 48 randomised controlled trials in 3,394 participants, covering eight categories of anti-inflammatory agent — omega-3 fatty acids (19 trials), NSAIDs, pioglitazone, minocycline, N-acetylcysteine, corticosteroids, statins and monoclonal antibodies.
The result favoured treatment: an odds ratio of 2.04 (95% CI 1.41–2.97, p=0.0002), with the effect strongest when used as an add-on to standard antidepressant treatment.
And now the caveats the authors themselves raise, which matter as much as the number:
- Significant publication bias. That is the authors' own assessment, and it is the single most important caveat in this literature. Publication bias inflates pooled effects, sometimes substantially.
- Moderate to high heterogeneity across trials — they were not measuring quite the same thing.
- No standardisation of dose across studies.
- Inconsistent depression rating scales, which makes pooling the results harder than it looks.
- And the agents were no better than placebo in treatment-resistant depression, while showing benefit in non-treatment-resistant cases.
So: a real signal, in a literature with a known lean. Interesting enough to keep testing, not solid enough to build a product story on — and notably, these were medicines used at therapeutic doses under supervision, not wellness supplements.
The claim that doesn't survive contact: measuring your own inflammation
This is where the marketing and the science part company completely.
There is no consumer test that tells you your "inflammation level" in a way you can act on.
CRP is a real and useful test — clinically it's used to detect and monitor infection and inflammatory disease, and a high-sensitivity version has a role in cardiovascular risk assessment. What it is not is a dial reading how inflamed you are in general. It is a non-specific acute-phase marker: it rises with infection, injury, recent illness, obesity, smoking, and a hard workout. A single CRP without clinical context tells you very little, and it certainly doesn't tell you which foods to eat or which supplement to buy.
The same applies to consumer "inflammation panels." Measuring several cytokines doesn't fix the interpretive problem — there is no validated threshold at which a healthy person should change their diet, and the values move around day to day.
If you have symptoms suggesting an actual inflammatory condition, the answer is a doctor ordering the right tests with a question in mind, not a panel bought online.
The anti-inflammatory diet, honestly
Here's the awkward part for the category: the dietary pattern associated with lower inflammatory markers is the dietary pattern associated with almost every other good outcome. More fibre and more plant variety, more fish, less ultra-processed food, less alcohol, adequate sleep, regular movement.
That's not a discovery about inflammation. It's the same advice arrived at from a different direction — which is reassuring about the advice and deflating about the framing. No single food is doing the work, and the concept of an "anti-inflammatory superfood" does not survive the observation that the whole pattern is what shifts the markers.
Two things genuinely worth noting because they are free and well supported:
Exercise lowers inflammatory markers over time, despite raising them acutely. And sleep loss raises them. The sleep relationship runs both ways, which makes it one of the more actionable levers — CBT-I has better evidence than anything you can buy if insomnia is the entry point.
The fibre point connects to the one mechanism in this area with a credible route to the brain: bacterial fermentation of dietary fibre producing short-chain fatty acids, which affect gut-lining integrity and immune signalling. Note again what drives it — fibre, not a capsule.
Where this touches our own range — and we're implicated
Worth being direct, because omega-3 accounted for 19 of the 48 trials above, and we sell omega-3.
So we have an obvious incentive to present that meta-analysis as validation, and we're not going to. Three reasons:
The publication bias caveat applies to the whole pool, omega-3 trials included, and it was the authors' own headline limitation.
The trials used therapeutic doses, often EPA-predominant and often well above a maintenance dose, as an add-on to antidepressant treatment in diagnosed depression. That is a different intervention from a general-purpose omega-3 capsule taken for brain health.
And an anti-inflammatory mechanism is a hypothesis about how it might work, not evidence that it does. Citing a mechanism to imply an outcome is the specific move this article is arguing against.
What we do have is the direct evidence on its own terms, written up without the inflammation framing bolted on: omega-3 and depression, where Cochrane's review moved depression scores by less than the threshold researchers treat as clinically meaningful, and omega-3 and cognitive ageing. Read those rather than this one if omega-3 is the actual question.
And on the supplement most heavily sold on inflammation: the curcumin absorption claims do not hold up, which is a useful case study in how a mechanism story gets converted into a number that means nothing.
Where inflammation genuinely matters, clinically
Not as a wellness concept — as actual disease, where it's treated by specialists with real drugs:
- Autoimmune and inflammatory conditions — rheumatoid arthritis, lupus, inflammatory bowel disease, multiple sclerosis. These are diagnosable and treatable, and they are not what "chronic low-grade inflammation" refers to.
- Vascular disease, where inflammation is part of the atherosclerotic process — which links it to stroke and dementia risk, though the interventions there remain blood pressure, lipids and smoking rather than anything anti-inflammatory you can buy.
- Neuroinflammation in neurodegenerative disease, an active research area and not yet a treatment target with anything to offer a consumer.
Worth a doctor rather than a diet: persistent joint swelling, morning stiffness lasting more than an hour, unexplained fever, unexplained weight loss, or a rash alongside joint pain. Those point at inflammatory disease, which has specific tests and specific treatment — and being told to eat turmeric instead is an actively bad outcome.
Widespread pain and fatigue without those features is more often chronic primary pain, which is a different mechanism entirely and where the guidelines are counter-intuitive.
Where we sit
Nothing Proco sells is an anti-inflammatory treatment, and we don't make that claim for any of it.
The honest position on this whole area: the mechanism is real and worth following, the treatment evidence is suggestive with a known publication-bias problem, and the gap between those two facts and "reduce inflammation with this capsule" is where most of the money in the category is made.
If persistent fatigue and fog are what brought you here, the unglamorous route is still the better one — four cheap blood tests, a sleep apnea screen, and an honest look at alcohol. None of those are inflammation, and all of them are more likely to be the answer.
This article is not medical advice. Inflammatory and autoimmune conditions require medical diagnosis and treatment, and nothing here should be used in place of that or to interpret a blood test result.