The Colour-vs-Beige Rule in Plain Terms

Stand at a buffet, glance down at your plate, and ask one question: how much colour is on it? That single check — taking perhaps a second — is the practical shortcut at the heart of Professor Paul Lee's approach to anti-inflammatory nutrition in Practical Regeneration (2026).

The rule is disarmingly simple. Under Pillar 2 — Chemistry: The Invisible War — Professor Lee, a Cardiff-trained orthopaedic surgeon and medical engineer, frames it as: colour equals antioxidants; beige signals ultra-processed, pro-inflammatory food. A plate rich in deep purples, bright oranges, dark greens and vivid reds is, broadly, a plate dense in the phytochemicals the body uses to keep inflammation in check. A plate dominated by pale, starchy, processed foods is the opposite.

This is a proxy, not a rigid colour chart. Its value is that it converts a tangle of nutritional decisions — omega-3 ratios, glycaemic indices, polyphenol profiles — into a fast, repeatable daily habit. That is the 'no hacks, just science and systems' spirit running through Professor Lee's work: a simple rule that encodes deeper biology. The sections that follow explain exactly what that biology is.

Chronic Low-Grade Inflammation as the Silent Problem

Inflammation is not the enemy — the acute kind is essential. When a tendon tears or an infection takes hold, the body floods the site with chemical messengers called cytokines, triggering swelling, heat and pain to drive repair. That process is meant to resolve within days.

The problem Professor Lee identifies in Practical Regeneration is the version that does not resolve. Chronic, low-grade inflammation is the same signalling system stuck on a permanent low hum — cytokines circulating at levels too modest to announce themselves dramatically, but high enough to interfere with the body's ordinary repair work. He calls this Pillar 2's central conflict: The Invisible War. It may not show up as obvious illness, but it does show up: in joints that ache well beyond what yesterday's session explains, in energy that fails to restore overnight, in a nagging sense of systemic drag that many people quietly attribute to age.

Because it is subclinical, it rarely gets named. Blood markers such as CRP and IL-6 often capture it; experience usually does not. That invisibility is precisely why diet becomes a high-leverage daily variable. Food is not the only input that shapes this internal chemical environment — sleep, movement, and stress all play roles across the four pillars — but it is one of the most consistently modifiable, three times a day.

What Colourful Foods Actually Do Inside the Body

The mechanism linking plate colour to internal chemistry runs through a single cellular control switch: a protein called NF-κB. In normal conditions it sits dormant; when chronically activated — by a sustained diet of ultra-processed food among other triggers — it instructs cells to produce inflammatory signals such as IL-6 and TNF-α. What pigment-bearing plants do, in broad terms, is help prevent that switch from staying permanently open.

A 2023 review cataloguing 56 dietary phytochemicals found they all converge on exactly this pathway. Professor Lee maps the mechanism compound by compound in Practical Regeneration:

• Curcumin and gingerols (turmeric, ginger) directly calm NF-κB-mediated signalling.
• Sulforaphane (broccoli) supports the body's detoxification pathways.
• Beta-carotene (sweet potato) and catechins (green tea) counter oxidative stress — the cellular wear that amplifies inflammatory output.
• Omega-3 fatty acids (oily fish such as salmon) reduce cytokine activity through a complementary but separate route, modulating signalling molecules called eicosanoids.

The most robust human-trial evidence belongs to anthocyanins — the pigments that give blueberries and blackberries their deep blue-purple colour. Research on anthocyanin supplementation suggests measurable effects: a 2025 randomised controlled trial in adults aged 60–80 found 320 mg per day for 24 weeks produced significant reductions in both CRP and IL-6; a 2020 dose-response study in 169 patients with dyslipidaemia recorded a 40% fall in IL-6 and a 37% drop in an oxidative stress marker at the same dose. These are supplementation studies rather than whole-food intervention trials, so the appropriate framing is that anthocyanin-rich foods may support similar responses — not that a punnet of berries guarantees an equivalent result.

Polyphenols bound in plant fibre add a further layer. Research shows they help preserve the integrity of the gut lining, reducing the body's systemic inflammatory load before it ever reaches the bloodstream — a direct bridge between the Chemistry and Biology pillars, and one reason fibre from colourful plant foods functions as considerably more than roughage.

Why Beige Foods Fuel the Fire

Flip the colour heuristic over and the same logic holds. Beige, heavily processed foods are not merely neutral — they actively push the body's inflammatory chemistry in the wrong direction through two distinct mechanisms.

The first is metabolic. Refined carbohydrates — white bread, crisps, pastries — digest so rapidly that blood glucose spikes sharply within minutes of eating. That spike triggers the release of inflammatory cytokines, making each high-glycaemic meal a small chemical stimulus in the same signalling network described in the previous section. Professor Lee names this mechanism explicitly in Practical Regeneration: the problem is not carbohydrate itself but the speed and volume of glucose arriving in the bloodstream.

The second is microbial. Ultra-processed foods are stripped of the fibre that gut bacteria rely on to produce short-chain fatty acids (SCFAs) — compounds that maintain the gut lining and dampen systemic inflammation. Without adequate fibre, pro-inflammatory bacterial strains are comparatively free to proliferate, and the gut barrier proteins that normally prevent microbial debris from entering the bloodstream become harder to sustain. Research confirms that bound polyphenols in dietary fibre help protect these barrier proteins — which is precisely what processing removes along with the colour.

That last point is where the nuance sits. Pale whole foods — oats, quinoa, cauliflower, garlic, mushrooms — retain their fibre and bioactive compounds intact. The heuristic flags ultra-processing, not pigment absence per se. A plate featuring white garlic and oats alongside colourful vegetables is well within the spirit of the approach; a plate of beige pastries and white bread is not.

A Day on the Anti-Inflammatory Plate

Professor Lee's sample anti-inflammatory day in Practical Regeneration is worth walking through not as a rigid meal plan but as a masterclass in phytochemical breadth — the point being that no single food carries the day; each adds its own strand to a cumulative chemistry.

Morning sets the tone with avocado and eggs alongside a handful of blueberries. The fruit delivers anthocyanins and polyphenols; the avocado contributes monounsaturated fats that help the body absorb fat-soluble plant pigments encountered throughout the day. Mid-morning, a cup of green tea and a small mix of walnuts and almonds extends the window: the tea's catechins arrive before lunch, and the nuts add vitamin E alongside a modest dose of plant-based omega-3s.

Midday is where the plate's colour logic becomes visible. Grilled salmon over a dressed salad — olive oil, pumpkin seeds, leafy greens — brings together marine omega-3s and a second wave of polyphenols from the greens. An afternoon snack of hummus with cucumber and carrot sticks continues the fibre-and-polyphenol thread, helping stabilise blood sugar between meals.

Evening pulls in the warmly coloured elements: turmeric-and-ginger-spiced chicken with roasted sweet potato and steamed broccoli. Each of those three supporting foods targets a different part of the body's inflammatory and detoxification chemistry — distinct compounds, distinct mechanisms, working alongside rather than duplicating what came earlier in the day. Two squares of 85% dark chocolate and chamomile tea close out with a further polyphenol contribution.

What the sequence demonstrates is design rather than deprivation: by the end of a single ordinary day, the plate has cycled through blue-purple, deep green, orange-yellow and rich red pigment families, each representing a different class of phytochemical. Small daily chemistry choices like these — varied, cumulative, and unremarkable in effort — are precisely what Practical Regeneration means when it frames nutrition as a long-term investment rather than a short-term intervention.

Chemistry Within the Bigger System

Plate colour matters most when physical stress enters the picture. In recovery from exercise — or simply the accumulating repair demands that increase with age — a chronically inflamed internal environment raises the cost: joints that stay sore longer, adaptation arriving late, energy that doesn't fully return overnight. Anti-inflammatory eating reduces that background cytokine load, which is why Professor Lee treats the Chemistry pillar as the condition under which the Physics pillar — movement, load, structured exercise — can do its best work. Colour on the plate, in this framing, is preparation for everything that follows the meal.

The gut-biology layer makes the interdependence concrete. Plant fibre from colourful vegetables feeds the bacteria that produce short-chain fatty acids; those compounds sustain the gut lining, regulate immune tone, and — via the gut-brain axis — influence sleep quality. Improving Chemistry therefore simultaneously improves Biology, which feeds back into physical recovery. These interactions run through Regeneration by Design (the conceptual parent of the framework, published in 2024) and are translated into everyday protocols in its hands-on companion Practical Regeneration (2026), where the full Chemistry pillar and its cross-pillar dependencies are laid out in practical terms.

The entry point remains simple: use colour as your plate-check this week — more saturated hues, less beige processing. The principles here reflect general wellness guidance drawn from Professor Lee's published work; for any specific health concern, a qualified healthcare professional remains the right guide.

1. [1] Phytochemicals and Regulation of NF-kB in Inflammatory Bowel Diseases: An Overview of In Vitro and In Vivo Effects. (2023). https://doi.org/10.3390/metabo13010096 https://doi.org/10.3390/metabo13010096
2. [2] Anthocyanin supplementation improves anti-oxidative and anti-inflammatory capacity in a dose–response manner in subjects with dyslipidaemia. (2020). https://doi.org/10.1016/j.redox.2020.101474 https://doi.org/10.1016/j.redox.2020.101474
3. [3] Bound polyphenols in insoluble dietary fiber modulate LPS-induced inflammation via NF-κB/JAK-STAT pathway. (2024). https://doi.org/10.1039/d3fo05579e https://doi.org/10.1039/d3fo05579e
4. [4] Anthocyanin supplementation in adults at risk for dementia: a randomized controlled trial on cardiometabolic and anti-inflammatory biomarker effects. (2025). https://doi.org/10.1007/s11357-025-01669-8 https://doi.org/10.1007/s11357-025-01669-8