A Rule You Can See on Your Plate

Put two plates side by side. One holds a fistful of blueberries, some roasted sweet potato, and a handful of dark spinach leaves. The other holds white bread, pale crisps, and a beige pastry. Before you read a single nutrition label, something about the first plate already looks more alive. That instinct, it turns out, is grounded in chemistry.

The observation sits at the heart of the Chemistry Pillar in Professor Paul Lee's Practical Regeneration: 'Colour = antioxidants. Beige = trouble.' It is deliberately concise — a kitchen-level shortcut to a question that stumps most people standing in a supermarket aisle. Nutrition panels rarely mention phytonutrients, antioxidant capacity, or polyphenol density. They are not legally required to. Yet these are precisely the compounds that plant scientists and longevity researchers now consider among the most consequential things we eat.

Colour, in whole food, is a visible proxy for those compounds. The vivid pigments in plants are not decorative; they are the phytonutrients themselves. Strip the colour — through heavy processing — and you largely strip the chemistry that travels with it.

What follows explains why the rule works, what each colour actually delivers inside the body, what the beige alternative quietly costs over time, and how to put the principle to use this week.

Why Plants Invest in Colour

Plants did not evolve their colours to appeal to human eyes. The reds, oranges, purples, and greens in whole foods are secondary metabolites — chemical compounds a plant manufactures to survive: shielding itself from ultraviolet radiation, repelling pathogens, and neutralising the oxidative stress that comes with living in full sun. Colour, in other words, is a plant's built-in sunscreen and immune system combined.

Each pigment family maps to a distinct chemistry. Reds signal lycopene and anthocyanins — potent free-radical scavengers found in tomatoes, strawberries, and red cabbage. Oranges and yellows indicate carotenoids, chiefly beta-carotene, in carrots and sweet potatoes. Greens flag chlorophyll, lutein, and isothiocyanates — compounds that give broccoli and kale their characteristic bite. Blues and purples signal anthocyanins and resveratrol, reaching their highest density in blueberries and blackberries.

That chemistry is most concentrated in the outermost layers. Apple skin carries several times the phytonutrient load of the flesh beneath it; blueberry pigment is far denser near the surface than at the core. Peeling produce, or choosing heavily processed versions of it, removes the most potent part of what you paid for.

The transfer to human biology is not a metaphor. The same oxidative threats the plant evolved to resist — reactive oxygen species, UV-induced cellular damage, inflammatory signals — are precisely the threats human cells face. Eating the pigment delivers the same molecular toolkit the plant built for itself.

What These Compounds Do Once Inside You

Once ingested, these pigments work through several interlocking pathways that go well beyond the popular 'antioxidant' label — which, while accurate, captures only part of what is happening at cellular level.

The most studied mechanism involves polyphenols and chronic inflammation. Research suggests polyphenols suppress the NF-κB signalling pathway — one of the central drivers of inflammatory gene expression. By dialling down NF-κB activity, they are associated with lower circulating levels of IL-6 and C-reactive protein (CRP), both established markers of systemic inflammation. This matters for long-term health because of what researchers now call 'inflammaging': the chronic, low-grade inflammatory state that accumulates with age and appears to accelerate biological decline across multiple systems simultaneously. Deeply pigmented foods — berries, pomegranate, dark leafy greens — are among the richest dietary sources of the polyphenols implicated in this process.

Two further mechanisms sit closer to Professor Lee's emphasis on cellular repair capacity. Evidence supports polyphenols activating SIRT1, a longevity-associated gene involved in the cellular stress response, and stimulating autophagy — the process by which cells identify and clear damaged components before they accumulate. A 2019 systematic review (Minich, cited over 160 times) broadened this picture further: phytonutrients modulate protein kinases and drive epigenetic modifications, suggesting they may influence which genes are expressed, not only how much oxidative stress is neutralised.

Carotenoids and chlorophyll are also associated with support for mitochondrial function — relevant because cellular energy production sits at the core of what the Chemistry Pillar is trying to protect.

Finally, polyphenols act as prebiotics, selectively feeding beneficial gut microbiota. That bridge between Chemistry and Biology is not incidental; it is where the systemic logic of Regeneration by Design becomes legible on a dinner plate. Beige ultra-processed alternatives, by contrast, deliver caloric load without these molecular signals — and, as the following section covers, introduce inputs the body must actively work against.

The Real Cost of Beige

The word 'beige' is doing precise chemical work here. In Professor Lee's framework it refers specifically to ultra-processed foods (UPFs) — a category defined by the NOVA classification as products so heavily industrially modified that they contain ingredients not found in a home kitchen: emulsifiers, synthetic sweeteners, preservatives, and flavour compounds added to compensate for what manufacturing strips out. White bread, packaged pastries, crisps, sweetened cereals, and many ready meals fall squarely in this group.

What UPFs lack is the subject of the previous section: the fibre, vitamins, and the phytonutrient compounds that give whole, colourful foods their biochemical value. What they add is the other side of the problem. Caloric density without molecular signals means the body receives energy but not the chemistry required for cellular repair, anti-inflammatory regulation, or mitochondrial upkeep. More than that, the high salt, sugar, saturated fat, and artificial additives that characterise many UPFs represent inputs the body must actively process as stressors rather than resources.

Population-scale data makes the cumulative cost of that trade-off legible. A systematic review and dose–response meta-analysis of 207,291 adults found heavy UPF consumption associated with 21% higher all-cause mortality and 50% higher cardiovascular mortality. Notably, for every 10% increment in UPF as a proportion of daily calorie intake, all-cause mortality risk rose by a further 15% in a confirmed positive linear relationship. A 2024 BMJ umbrella review — since cited over 1,300 times — reinforced the picture, linking high UPF exposure to cardiometabolic disease, common mental health disorders, and premature death. The NHS, for its part, formally advises most people to reduce UPF consumption.

None of this is intended as a verdict on the occasional biscuit. It is simply a description of what the chemistry does at scale — and why colour is a more reliable guide to nutritional value than almost any label claim.

When Pale Whole Foods Still Win

The colour rule has one important boundary: it describes processed foods, not all pale ones.

Garlic and onions are cream and white, yet both are rich in allicin and quercetin — compounds with well-evidenced anti-inflammatory and antimicrobial properties. Cauliflower, despite its pallor, contains glucosinolates: the same sulphur-based family that gives broccoli much of its cellular-repair reputation. Mushrooms bring beta-glucans, which support immune modulation, alongside a useful B-vitamin profile. None of these foods are nutritionally poor; they simply do not rely on visible pigment to carry their chemistry.

The distinguishing signal, then, is not colour in isolation but the difference between a whole food and an ultra-processed one. Colour is a fast, reliable shortcut in the produce section — where every vivid shade tends to indicate genuine phytonutrient density. It is a poor guide in the processed-food aisle, where artificial dyes can tint a product without contributing anything of biochemical value.

A more precise version of the rule: maximise colour across the whole-food sections, do not fear pale whole foods, and minimise beige packets.

Putting Colour on Your Plate This Week

Start with a simple audit: look at what you ate yesterday and count the distinct colours on your plate. If the answer is one or two — and one of them is beige — you have a clear, immediate design opportunity.

The practical target is not perfection but visible diversity across the week. Aim to move through each colour group — red, orange, yellow, green, blue-purple — rather than maximising a single favourite. Different pigment classes carry different compound types, so range matters more than repetition. Where you can, eat the skin: the outer layer of apples, courgettes, grapes, and blueberries holds the highest concentration of phytonutrients. Cooking is not the enemy — lycopene in tomatoes actually becomes more bioavailable with heat, while vitamin C and some polyphenols prefer minimal cooking. Raw and lightly cooked both count; variety of preparation often means variety of compound.

Zoomed out, this is what Professor Paul Lee's Chemistry Pillar is pointing at: food colour is not a nutritional nicety — it is molecular input that shapes the body's internal environment. The polyphenols and fibre in colourful whole foods feed the gut microbiome, which sits at the heart of the Biology Pillar. The mitochondrial support those compounds provide feeds directly into the Physics Pillar — the energy available for movement, recovery, and repair.

Choosing colour is not following a rule. It is designing the chemistry your cells work with.

1. [1] Polyphenol – Wikipedia. https://en.wikipedia.org/?curid=362892 https://en.wikipedia.org/?curid=362892