Inflammation is how your body heals a wound and clears an infection. The problem is a body that never puts the fire out, and the reason is usually how the pieces talk to each other.
Inflammation is having a moment. It made the cover of The New York Times Magazine this summer, and the attention is deserved: a growing body of research ties a low, chronic version of it to heart disease, dementia, diabetes, and the general wear of aging. The coverage points at food and the body, and that is fair. What you eat and how you move matter as much as anything you control, and we stand fully behind that.
What usually gets left out is the layer that ties them together. Your nervous system is the conductor. It sets whether you actually break down the good food you eat, whether your body can use the movement you give it, and whether the fire gets to settle or keeps burning. Diet and calm work on the same body through the same wiring.
We have said it for years: inflammation regulation is the key to life. Here is how the whole system fits together, and what to do about it.
Two fires, and why you should not put one out
Acute inflammation is one of the best things your body does. Cut your finger and the heat and swelling are your immune system rushing in to heal it. It flares, finishes, and shuts itself off. Chronic inflammation is the opposite: a low flame that never fully goes out, quiet enough to ignore but hot enough to damage your arteries, brain, and joints for years. Researchers call the version that builds with age inflammaging.
That distinction changes the whole goal. You need the acute kind, and blunting inflammation across the board is its own kind of harm.
You need the acute fire. The work is convincing your body it no longer needs to keep the other one burning.
It drives the disease
For years this was a chicken-and-egg question. Nobody could say whether sick tissue was inflamed because inflammation caused the damage, or whether inflammation only showed up alongside it. A 2017 trial called CANTOS settled it. A drug that does nothing but lower one inflammatory signal, changing nothing about cholesterol or blood pressure, cut the rate of second heart attacks. Lowering inflammation alone reduced the disease. As the Harvard cardiologist Peter Libby put it, "We all study the same disease." That same fingerprint now runs through heart disease, diabetes, Alzheimer's, and depression, and even the new GLP-1 drugs appear to work partly by cooling inflammation, on top of the weight they take off.
Where the smolder starts
Most of the smolder comes from ordinary habits: a processed diet, more alcohol than your liver wants, and too little movement all keep the fire lit. On top of that, aging adds its own. Some worn-out cells stop dividing but refuse to die, and these senescent "zombie" cells sit in your tissues and leak a steady stream of inflammatory signals, which a 2026 Mayo Clinic study in Nature traced to the cells' own failing mitochondria, the engines we spent August on. The fat packed deep around your organs adds more, behaving like a gland that secretes inflammatory messengers.
All of that is real, and most of it runs through what you eat, what you drink, and how you move, which is exactly why they matter so much. What decides whether those signals settle or keep amplifying is the system sitting over the top of them.
The conductor: your nervous system ties it together
If you have worked with us, you have heard us describe the nervous system as a glass. Simply keeping you alive fills it about two-thirds. Work, worry, poor sleep, screens, and old injuries keep topping it up, and when it overflows, the body reads life as a standing emergency. We call that neurological overload, and it sets the terms for everything else on this list.
How a worry becomes a molecule
Psychological stress lights the fire on its own. A 2017 review led by Anna Marsland at the University of Pittsburgh pooled lab studies in which a purely mental stressor, something as simple as a timed speech in front of a cold-faced audience, raised interleukin-6, one of the body's main inflammatory signals, within an hour or two. There was no wound and no germ, only a threat in the mind, and the blood inflamed. One well-mapped path is direct: fight-or-flight chemicals like adrenaline land on receptors that sit right on your immune cells, and the message they deliver is to switch on the genes that produce inflammation. And the effect outlasts the moment. Steve Cole's group at UCLA has found the same shift written into the gene activity of white blood cells in people carrying long-running stress: loneliness, grief, a job that never lets up.
The body does this because for most of human history, a threat meant a possible injury, and an injury meant infection. Mobilizing inflammation before the wound arrived was smart preparation. Your immune system still follows that ancient order. It cannot tell a predator from a deadline, so it preps for a wound that never comes, day after day, and over time that standing preparation can itself become the damage.
And that is only the gas pedal. Chronic stress also wears out the brake. Under stress your body releases cortisol, which in short bursts actually calms inflammation. But when the stress never lets up, the immune system goes deaf to cortisol's signal, a state called glucocorticoid resistance. Once the brake fails, the fire is free to burn. This is why the same clean meal does more for a calm body than a frazzled one, and why the person eating an immaculate diet who is still wired, underslept, and braced against their own life often stays inflamed anyway. The food is right. The body is too alarmed to make full use of it.
A clean plate lands differently in a body that feels safe.
What one bad night does
Sleep belongs in this section, because sleep is when the nervous system does most of its standing down. Cut it short and the fire gets a direct order. In a study from Michael Irwin's lab at UCLA, published in the Archives of Internal Medicine in 2006, healthy adults were kept awake from 11 p.m. to 3 a.m. for a single night. The next morning their white blood cells were producing more of the inflammatory signals IL-6 and TNF, and a small follow-up study from the same lab found the master inflammatory switch NF-kB turned on, at least in the women in the group, the same switch chronic stress flips. A 2016 analysis by Irwin's group in Biological Psychiatry pooled 72 studies covering more than 50,000 people and found that disturbed sleep tracks with higher CRP and IL-6, two standard blood markers of inflammation. CRP is the one a doctor usually draws.
It runs the other way too. Inflammatory signals can fragment sleep, so a body that is already inflamed sleeps worse, and sleeping worse feeds the inflammation. That loop has the same exit as everything else in this piece. The slow exhale that trains your CO2 tolerance is also a way into the calm state sleep needs, and a gut that is digesting instead of bracing is a gut that lets you sleep. Protect the night and the fire loses one of its most reliable fuels.
The two-way street you can feel: your gut and your emotions
The clearest place to watch this play out is digestion, because you can feel it happening. Breaking food down is a "rest and digest" job, run by the calm side of your nervous system. A body stuck in fight or flight does the opposite of resting, so it throttles digestion down, slowing stomach acid, enzymes, and the muscular squeeze that moves a meal along. In other people the same alarm runs the opposite direction and hurries everything through: the stomach slows but the lower gut speeds up, stools turn loose, and the meal is pushed out before much of it can be absorbed. Slowed or rushed, the result is the same, a digestive system no longer setting its own pace. Either way, food half broken down arrives downstream to feed the wrong bacteria and irritate the gut lining, and an irritated gut becomes its own source of inflammation. Stress can turn good food into a problem before it is ever absorbed.
The wire that carries all of this is the vagus nerve, the long cable running from your brainstem down through the chest and into the gut. It is the main line into the calm, parasympathetic side of your nervous system, and it runs in both directions. It tells digestion to switch on, and it carries the gut's report back up to the brain, which is a real part of why a churning stomach and a churning mind so often show up together. It also speaks directly to the fire: the neurosurgeon Kevin Tracey mapped a circuit he named the inflammatory reflex, in which the vagus senses inflammation rising and signals the immune system to throttle it back. A well-toned vagus tends to run alongside lower inflammation in the blood.
So the loop closes. Your emotions change how you digest, your digestion changes how you feel, and inflammation is a good part of what the two say to each other when the message is stress. Calm the system and you digest better; digest better and the system calms. That is the integration, and it is why the next piece matters.
Food and calm are the same project. Your gut is where they meet.
The number you can actually check
Here is where it turns practical, because the state of that system is measurable. How much carbon dioxide you can calmly tolerate is a physical readout of how twitchy your internal alarm is. Decades ago the psychiatrist Donald Klein proposed that anxiety-prone people carry a hypersensitive "suffocation alarm" that misreads a normal rise in CO2 as a threat. A 2026 meta-analysis in Biological Psychology put numbers to it. A shorter comfortable breath-hold, a simple proxy for low CO2 tolerance, tracked with greater anxiety-related vulnerability. A body that panics at a little CO2 is a body living next to its own alarm, and that is the same nervous system keeping the fire lit and holding your digestion down.
PNEO is now on Android. As of this month our app runs on Android phones as well as iPhone, and the timing matters, because this number moves. A slow, extended exhale is one of the few direct switches you have into the calm side of your nervous system, the same switch that lets your gut get back to work, and trained a few minutes a day it raises your CO2 tolerance and resets your default away from a constant signal of danger. That is the whole idea behind PNEO: it measures your CO2 tolerance, then trains it up, free, on either phone.
Start by finding out how hot your fire is
Our two-minute check scores your inflammation load, measures your CO2 tolerance on the spot, and tells you the one change that would cool yours the fastest.
Take the quiz: How hot is your fire? →
Do this: Test your CO2 tolerance in the quiz, then train it in PNEO, free on the App Store or Google Play. For the fuller picture of what is filling your glass, take the Neurological Load Assessment.
Eat and move so the system can stand down
Once you see the loop, food and movement stop being a separate checklist and become the other half of the same message: you are safe, you can put the fire down. And they carry real weight on their own. Nothing touches the inflammation dial as often as your fork. Ultra-processed food is the clearest, best-proven driver on the list, while real food cools it: whole ingredients, a clean cooking oil (avocado for a hot pan, olive to finish), and a plate built mostly from vegetables and other whole plants, which also feeds the gut bacteria that talk back to your nervous system. Movement lowers inflammatory markers directly and burns off the visceral fat that pumps them out, and it drains the glass at the same time, but only the kind you will actually keep doing, which is exactly what Kele's new Movement by Design course is built to make possible.
Do this: Cook one of the two stir-fries below tonight, and join the Movement by Design waitlist, where the live beta cohort is free.
If you want targeted backup, three from Designs for Health cover most of it: OmegAvail Hi-Po for omega-3s, Inflammatone for curcumin, ginger, and boswellia, and DigestZymes to help a stressed, slowed gut actually break a meal down. Use code FIRE15 at checkout.
Two anti-inflammatory stir-fries
Both are built for a weeknight, and both go over a bowl of steamed rice, because a stir-fry needs something under it to count as dinner. Ginger and garlic do the flavor work in both bowls, and the same coating trick, a spoon of aminos and a little starch, keeps the beef tender and gets the tofu crisp.
The Meat Version: Grass-Fed Beef & Broccoli Stir-Fry over Rice
Serves 2 · About 25 minutes · About 42 grams of protein a plate
For the beef
14 oz grass-fed flank or sirloin steak, thinly sliced against the grain
3 tbsp coconut aminos or gluten-free tamari, divided
1 tsp arrowroot or tapioca starch
For the rest
1 tbsp avocado oil (the high-heat oil)
4 cups broccoli florets
3 cloves garlic, minced
1 tbsp fresh ginger, grated
1 tsp toasted sesame oil, to finish off the heat
Pinch of red pepper flakes, optional
Sesame seeds and sliced scallions, to finish
Steamed rice, to serve
Method
Start the rice. Toss the sliced beef with 1 tbsp of the coconut aminos and the arrowroot so every slice is lightly coated. The starch keeps the beef tender and thickens the pan juices at the end.
Heat the avocado oil in a wok or wide skillet over high heat. Sear the beef in a single layer for about 2 minutes, then remove it to a plate. Do not crowd the pan.
Add the broccoli and a splash of water. Stir-fry 3 to 4 minutes, until crisp-tender.
Add the ginger, garlic, and pepper flakes and cook 30 seconds. Return the beef, pour in the remaining 2 tbsp coconut aminos and the sesame oil, and toss 1 minute until glossy.
Finish with sesame seeds and scallions. Serve over the rice.
The Vegetarian Version: Tofu & Bok Choy Stir-Fry over Rice
Serves 2 · About 25 minutes
For the tofu
1 block (14 to 16 oz) extra-firm tofu, pressed dry and cut into 1-inch cubes
3 tbsp coconut aminos or gluten-free tamari, divided
1 tsp arrowroot or tapioca starch
For the rest
1 tbsp avocado oil (the high-heat oil)
3 heads baby bok choy, chopped, stems and leaves kept separate
1 cup snap peas, strings removed
1 cup shelled edamame, thawed
3 cloves garlic, minced
2 tsp fresh ginger, grated
1 tsp toasted sesame oil, to finish off the heat
Sesame seeds and sliced scallions, to finish
Steamed rice, to serve
Method
Start the rice. Press the tofu between towels for 10 minutes so it browns instead of steams, then toss the cubes with 1 tbsp of the coconut aminos and the arrowroot.
Heat the avocado oil in a wok or wide skillet over high heat. Sear the tofu in a single layer, turning once or twice, until golden on most sides, about 5 minutes. Remove to a plate.
Add the bok choy stems, snap peas, and edamame with a splash of water. Stir-fry 3 minutes.
Add the garlic and ginger and cook 30 seconds. Add the bok choy leaves, return the tofu, pour in the remaining 2 tbsp coconut aminos and the sesame oil, and toss 1 to 2 minutes until the leaves wilt and everything is glossy.
Finish with sesame seeds and scallions. Serve over the rice.
One note on the tofu: buy extra-firm, and press it. Ten minutes between two towels with a pan on top pulls out the water that would otherwise keep it from browning. The edamame is there for protein, so the plant bowl holds its own next to the beef.
Regulate the fire, one signal at a time
Chronic inflammation is a body that has been told, over and over, that it is not safe, and it answers the way it was taught, gradually, through what becomes normal for you. So the work is to send the opposite signal from every direction at once, until your body believes it: a slower breath, a calmer gut, a real night's sleep, a plate of food it recognizes, movement it can trust. Each one makes the next one land better. Do that consistently and the fire has less and less reason to burn. Because inflammation regulation is the key to life.
Cook something clean tonight. Your future self is paying attention.
Fred & Kele
The deeper science, the brain and microglia, the gut second front in full, and a brain lipid you can actually test, is coming in a companion deep dive.