Food & alt-protein
Sixty-one subjects, from cultivated meat to tea oxidation — held together by three constraints that recur whatever the technology.
This is the largest cluster in the reference, and its subjects look unrelated — growing muscle in a tank, printing a purée, oxidising a tea leaf, feeding a cow seaweed. Reading them together, the same three constraints keep reappearing, and they are worth having in mind before starting anywhere.
The binding constraint is usually not the biology of making the molecule. It sits somewhere else in the system. Cultivated meat is limited by oxygen diffusing about a hundred to a few hundred micrometres into unvascularised tissue, not by cell biology. Carbohydrate intake during exercise is capped by one intestinal transporter saturating, not by muscle demand. Single-cell protein is capped by the uric acid produced from its RNA. Gas fermentation is limited by how fast hydrogen crosses from bubble into water. Precision fermentation’s cost usually lies in recovering the product, not in making it. In each case, understanding the process means finding the step that is not the obvious one.
Composition is not behaviour. A casein with the correct amino-acid sequence is not milk protein until it is phosphorylated and assembled into a calcium-phosphate micelle. A fat with cocoa butter’s fatty acids does not melt like cocoa butter unless those acids sit in the right positions on the glycerol. Insect meal’s crude protein figure counts nitrogen that is chitin, not protein. Structure and arrangement carry the function, and a specification that lists only composition is describing something other than the property being sold.
A mechanism demonstrated in a dish is not an effect in a person. This is the recurring problem across the nutrition subjects — bioactive peptides, polyphenols, lactoferrin, milk oligosaccharides. The compound must be present and stable, at a dose a diet can deliver, absorbed, and still active after first-pass and microbial metabolism. Most claimed bioactives fail at the second or third of those, and the pages here say so where that is the case.
Start with alternative proteins. It sets out what animal muscle actually is — anisotropic protein structure, water holding, lipid-derived flavour, heme iron — and every substitution route in this cluster is best read as an attempt on one or more of those four properties.
Pages are ordered from the platform sciences through the cell- and biomass-based routes, then specific molecules, nutrition and feed, consumer formats, and the sector-processing subjects. Two of the food-safety mechanisms recur widely enough to be worth knowing early: the pH 4.6 threshold below which Clostridium botulinum cannot grow, and water activity as the master variable for microbial survival in a dry matrix.
Articles 61
| Alternative proteins Meat is not a protein — it is a protein arranged a particular way, holding water, carrying fat-derived flavour. Each of those is a separate problem. |
| Precision fermentation Not brewing a microbe for its biomass, but instructing it to make one specific molecule and give it back — where the difficulty is folding, secretion and recovery. |
| Traditional fermentation Salt, exclusion of air and time select for the organisms you want — a microbial ecology managed without ever isolating a strain. |
| Food microorganisms & starter cultures A defined culture removes the guesswork from fermentation — and creates a single point of failure that bacteriophage exploits. |
| Fermented food ingredients Umami is not one taste stimulus but two acting multiplicatively — which is what most fermented savoury ingredients are exploiting. |
| Brewing capacity as a fermentation platform A brewery has tanks, utilities and people who understand fermentation. What it does not have is sterility, containment or a purification train. |
| Cultivated meat Why animal cells will grow in a tank but will not, on their own, become a steak. |
| Cultured fats & cellular lipids Fat carries most of what makes a meat taste of its species — and unlike muscle, it does not need to be structured. |
| Cultured seafood Fish cells are in several ways easier to culture than mammalian ones — and the nutrient that makes seafood worth eating does not come from the fish. |
| Cultured meat for pet food The biology is the same; the nutritional target and the tolerable purity are not. |
| Mycoprotein & fungal biomass A filamentous fungus grows as aligned fibres, so the texture comes free — and the RNA that comes with it sets a hard ceiling on how much you can eat. |
| Industrial insect farming The efficiency advantage is real, and it belongs to the substrate — not to the insect. |
| Insect protein foods Good amino-acid quality wrapped in a polysaccharide humans cannot digest — and an allergen shared with shellfish. |
| Algal protein isolates Two organisms, two different problems: one has a cell wall you must break, the other has a pigment you cannot heat. |
| Gas fermentation for food protein Protein from CO₂ and electricity — where the binding constraint is not biology but getting hydrogen into water without making an explosive mixture. |
| Molecular farming for food A field needs no stainless steel and no sterile air. What it needs is a way to get one protein out of a tonne of leaf. |
| Meat–plant hybrids Keeping some animal protein keeps the gel that holds the product together — which is the part plant protein struggles to replace. |
| Fermentation-derived dairy & egg proteins Whey arrived first because it is a simple folded protein. Casein is hard because a casein alone is not milk — the micelle is. |
| Fermentation-derived fats & oils Oleaginous microbes store fat when starved of nitrogen — but matching a fat means matching where the fatty acids sit on the glycerol, not just which ones are present. |
| Fermentation-derived infant formula proteins Lactoferrin works by taking iron away from bacteria — and by being heat-labile, which is exactly why it is hard to put in a tin. |
| Human milk oligosaccharides Sugars the infant cannot digest, present in quantity — because they were never meant for the infant. |
| Sweet proteins A protein a thousand times sweeter than sugar by weight — because it binds the receptor across a large surface instead of dropping into a pocket. |
| Rare sugars A sugar the body absorbs but cannot metabolise — which is why it browns like sugar and yet supplies almost no energy. |
| Bee-free honey Honey preserves itself by three mechanisms at once — and one of them is an enzyme the bee adds, not the flower. |
| Fermented hydrocolloid gums Xanthan holds particles in suspension because it is a weak solid at rest — and pours because shear breaks the network, not the molecule. |
| Food biopolymers, starches & polysaccharides Bread goes stale because a polymer slowly recrystallises — not because it dries out. |
| Natural food colours Natural pigments are metabolites that had a job in a living cell — stability in a bottle was never among their design constraints. |
| Microbial flavour & fragrance production The molecules worth making are volatile, oily and toxic to the cell making them — which is why the extraction phase is part of the reactor. |
| Enzymatic texture & flavour modification An enzyme is a processing aid that makes one specific bond and then stops — which is why it can replace an additive without appearing on the label. |
| Enzymatic approaches to gluten Gluten resists digestion because it is full of proline, and humans have no enzyme that cuts after proline in the gut. |
| Deactivating anti-nutritional factors Seeds defend themselves chemically. Most plant-protein processing is the work of undoing those defences without destroying the protein. |
| Bioactive peptides Sequences with real activity in a test tube — and a brush border full of peptidases between them and the bloodstream. |
| Feed amino acids Adding one purified amino acid lets you feed less protein overall — which is why the nitrogen in the manure falls. |
| Animal probiotics & postbiotics The hardest part of a feed probiotic is that it must still be alive after the pellet mill — which is why the field is dominated by spores. |
| Chelated minerals A metal ion that stays soluble reaches the absorptive surface — and the ligand has to hold it tightly enough to travel, loosely enough to let go. |
| Fermentation-grown mineral supplements Feeding selenium to yeast does not chelate it — the yeast builds it into protein in place of sulfur, which is a different thing entirely. |
| Vitamin production Three vitamins, three completely different reasons the industrial route looks the way it does. |
| Functional foods & nutraceuticals Most claimed bioactives fail at the same two places: the dose that worked in a dish, and the fraction that reaches the blood. |
| Freeze-dried functional foods Removing water as vapour from ice, without ever passing through liquid — which is why the structure and the heat-labile compounds survive. |
| Superfood products The antioxidant framing that built this category was withdrawn by the people who created it — and what replaced it is a more interesting mechanism. |
| Functional mushroom supplements β-glucans have a receptor, which is unusually solid ground — and a simple assay reveals whether the product contains mushroom or mostly grain. |
| Adaptogens A pharmacological category with a written definition from 1947 — and the useful question is whether a given product meets it. |
| Functional beverages Water is the fastest delivery vehicle in food and the most hostile storage medium — a functional drink is a fight between those two facts. |
| Living culture beverages Kombucha is two organisms trading: yeast makes the alcohol, bacteria eat it. The residual alcohol is what the trade leaves behind. |
| Dealcoholised & non-alcoholic drinks Removing ethanol removes a solvent, a sweetener, a body agent and a preservative — which is why the gap is never only the alcohol. |
| Sports nutrition gels One intestinal transporter saturates near 60 grams an hour. Adding a sugar that uses a different one is how the ceiling was raised. |
| Probiotic confectionery Chocolate is a surprisingly good home for a probiotic — because there is almost no water in it, and what water there is cannot move. |
| Functional chewing gum The gum base is a hydrophobic solvent — so whether an active is released at all depends on how much it prefers water to rubber. |
| Toddler nutrition The second year is where iron requirement per kilogram peaks and the food that most reliably supplied it stops being the main meal. |
| Cycle-based nutrition products The menstrual cycle does change metabolism measurably — and the best-established nutritional consequence is the one these products rarely address. |
| Koji & solid-state starters The mould does not ferment anything. It secretes the enzymes that let something else ferment — which is why koji is a two-stage process. |
| Home fermentation kits A kitchen has none of the controls a factory has — so a kit's real job is to replace each missing hurdle with a physical object. |
| Home mushroom growing kits The kit arrives already colonised because colonisation is the phase that fails — after that, fruiting is a matter of telling the fungus it has reached the surface. |
| Seaweed foods Seaweed concentrates whatever is in seawater — which is why it is rich in iodine and why that is both the nutritional case and the safety limit. |
| 3D food printing The material has to flow like a liquid through the nozzle and behave like a solid a millisecond later — and then survive being cooked. |
| Deep grain processing Starch granules are trapped in a protein matrix, and sulfur dioxide is what lets go of them — the whole wet-milling industry turns on that one bond. |
| Oils & fats processing biotech Interesterification replaced partial hydrogenation because it changes where the fatty acids sit without touching the double bonds — and it was the double bonds that made trans fat. |
| Sugar processing biotech A bacterium turns sucrose into a polymer that will not crystallise — and the enzyme that fixes it is the sugar industry's most specific biotechnology. |
| Coffee processing biotech The fermentation step in coffee removes a layer of pectin — whether it also creates flavour is a genuinely open question. |
| Tea processing biotech Black tea is not fermented. It is oxidised by the leaf's own enzymes — and the one tea people call aged is the only one microbes actually make. |
| Wine microbiology & terroir A spontaneous ferment is a relay: several yeasts start it, and the one that finishes it is the one that tolerates what the others produced. |