Food & alt-protein

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.

Alternative proteins Why animal muscle is hard to imitate: anisotropic myofibrillar structure, water-holding, heme and lipid-derived flavour chemistry, and the amino-acid and mineral gaps that follow from using seed storage proteins.
Precision fermentation Heterologous expression in microbial hosts: host choice, secretion and folding limits, glycosylation differences, the titre–rate–yield triangle, and why downstream recovery usually dominates the cost.
Traditional fermentation Spontaneous lactic fermentation: microbial succession in vegetable ferments, the pH 4.6 safety hurdle, why salt concentration is a selection tool, and the trade-off between shelf stability and live cultures.
Food microorganisms & starter cultures Defined versus undefined starter cultures, acidification kinetics, phage as the central vulnerability of industrial dairy fermentation, and how cultures survive freeze-drying.
Fermented food ingredients Yeast extract and fermented seasoning bases: autolysis chemistry, glutamate–ribonucleotide umami synergy, protease hydrolysis and the bitterness it creates, and why the enzymatic route displaced acid hydrolysis.
Brewing capacity as a fermentation platform What transfers when brewing and distilling assets are repurposed for recombinant protein production — vessel geometry, oxygen transfer, heat removal — and the three things that do not: sterile design, GMO containment and downstream processing.
Cultivated meat The cell biology and transport physics behind growing muscle and fat outside an animal — and the two constraints, media chemistry and oxygen diffusion, that set the ceiling.
Cultured fats & cellular lipids Adipocyte differentiation and lipid accumulation in culture, why fatty-acid profile is set by the medium rather than the cell, and why cultured fat is mechanically easier than cultured muscle but harder to handle.
Cultured seafood Why fish cell lines tolerate lower temperatures and wider osmolarity, the simpler geometry of fish muscle, and why omega-3 long-chain fatty acids have to be supplied rather than assumed.
Cultured meat for pet food Why cell-cultured protein reaches pet food first: obligate-carnivore nutrient requirements, palatability driven by different receptors, and the different purity and processing thresholds of a feed product.
Mycoprotein & fungal biomass Fungal biomass protein: why hyphal morphology gives meat-like texture without extrusion, continuous airlift fermentation and its stability limit, and the nucleic-acid reduction step that is a safety requirement rather than a refinement.
Industrial insect farming Black soldier fly and mealworm rearing: why ectothermy and larval assimilation give high feed conversion, why crude protein is systematically overstated, and why the substrate a larva may legally eat decides the whole case.
Insect protein foods Insect protein for human food: amino-acid quality and lysine content, chitin as an indigestible matrix that lowers measured digestibility, tropomyosin cross-reactivity with crustacean allergy, and the spore-former problem.
Algal protein isolates Chlorella and spirulina as protein sources: cell-wall disruption energy, phycocyanin's thermal and pH instability, self-shading as the ceiling on photoautotrophic productivity, and the nucleic-acid limit.
Gas fermentation for food protein Hydrogen-oxidising bacteria and methanotrophs as food protein: the knallgas reaction, hydrogen mass-transfer and flammability limits, the electricity-to-protein efficiency chain, and the nucleic-acid ceiling.
Molecular farming for food Plants as protein bioreactors: why upstream capital is low and downstream recovery is harder than fermentation, plant-specific glycosylation, seed targeting for stability, and containment of a crop that is a production organism.
Meat–plant hybrids Blended meat and plant products: the salt-soluble myofibrillar gel network, why dilution degrades texture non-linearly, water and fat binding, and which nutritional properties survive a partial substitution.
Fermentation-derived dairy & egg proteins Recombinant milk and egg proteins: why whey proteins express readily, why casein needs phosphorylation and calcium-phosphate micelle assembly, egg-white functionality as a mixture, and why identical sequence means identical allergen.
Fermentation-derived fats & oils Microbial lipid production: nitrogen-limited triglyceride accumulation, desaturase and elongase control of chain length and saturation, why cocoa-butter equivalence is a regiochemistry problem, and algal long-chain omega-3.
Fermentation-derived infant formula proteins Lactoferrin and other bioactive milk proteins in formula: iron sequestration and the lactoferricin peptide, why glycosylation and the apo form matter, thermal lability against processing, and the limits of the breast-milk comparison.
Human milk oligosaccharides HMO structure and the two mechanisms that explain them: selective feeding of Bifidobacterium and decoy inhibition of pathogen adhesion; secretor status; and why the producing strain must be prevented from eating its own substrate.
Sweet proteins Brazzein, thaumatin and monellin: the wedge model of sweet-taste receptor activation, why sweetness onset is slow and lingering, the heat- and pH-stability differences between them, and why they cannot replace sugar's bulk.
Rare sugars Allulose and tagatose: enzymatic epimerisation from commodity sugars, why absorption without metabolism gives near-zero calories, why they still undergo the Maillard reaction, and the osmotic tolerance limit.
Bee-free honey What honey actually is: invertase and glucose oxidase, the water-activity and pH hurdles, supersaturation and crystallisation, the botulism spore issue, and why isotope ratios detect adulteration.
Fermented hydrocolloid gums Microbial polysaccharide gums: helix formation and shear-thinning in xanthan, yield stress as the reason particles stay suspended, ion-triggered gelation in gellan, and how acyl content switches a gel between brittle and elastic.
Food biopolymers, starches & polysaccharides Starch granule architecture, gelatinisation and retrogradation, why staling is amylopectin recrystallisation, the five classes of resistant starch, and enzymatic versus chemical modification.
Natural food colours Why anthocyanins shift colour with pH, betalains resist acid but not heat, carotenoids oxidise and isomerise, and phycocyanin behaves like the protein it is — and what fermentation changes about supply.
Microbial flavour & fragrance production Terpenoid and vanillin biosynthesis in engineered microbes: the MVA and MEP routes, cytochrome P450 bottlenecks, product toxicity and in-situ removal with a second phase, and what 'natural' means as a process definition.
Enzymatic texture & flavour modification Transglutaminase cross-linking, maltogenic amylase against staling, proteases and lipases in ripening, and asparaginase as a case where an enzyme removes a chemical hazard rather than adding a property.
Enzymatic approaches to gluten Why the immunogenic gluten peptides survive digestion, the role of transglutaminase-2 deamidation and HLA-DQ2/DQ8 presentation, how prolyl endopeptidases work — and why the clinical evidence does not support them as a treatment.
Deactivating anti-nutritional factors Phytate and stepwise phytase dephosphorylation, heat-labile and heat-resistant protease inhibitors, lectins, raffinose-family oligosaccharides, and why fermentation, germination and enzyme addition attack different targets.
Bioactive peptides Encrypted peptide sequences released by hydrolysis, the best-characterised activities, and why in-vitro potency so rarely survives digestion and absorption — the bioavailability problem that defines the field.
Feed amino acids The ideal-protein concept and first-limiting amino acids, industrial lysine fermentation and feedback-resistant enzymes, why methionine is supplied as a racemate, and the absorption-synchrony limit.
Animal probiotics & postbiotics Competitive exclusion and colonisation resistance, bacteriocins and barrier effects, why pelleting temperature selects for spore-forming Bacillus, and what postbiotics change by abandoning viability.
Chelated minerals Why free mineral ions are poorly absorbed, how organic ligands shield them from phytate and from each other, why the stability constant must fall in a window, and what the evidence does and does not show.
Fermentation-grown mineral supplements Mineral-enriched microbial biomass: selenomethionine substituting for methionine, why that creates a body store rather than a bolus, chromium and zinc analogues, and the narrow margin that makes selenium dosing unforgiving.
Vitamin production Why B12 must be made by fermentation, how riboflavin fermentation displaced a chemical synthesis, the two-step fermentation behind vitamin C, and the photochemistry that makes vitamin D3.
Functional foods & nutraceuticals What separates a mechanism from a health effect: bioavailability, matrix effects, the in-vitro dose gap, first-pass and microbial metabolism, and what a substantiated health claim actually requires.
Freeze-dried functional foods Lyophilisation physics: sublimation below the triple point, primary and secondary drying, the collapse temperature that sets the process ceiling, and why glass formation is what preserves viability.
Superfood products Nutrient density as a measurable property, why in-vitro antioxidant capacity was abandoned as a food metric, polyphenol bioavailability, and the hormetic signalling model that better fits the evidence.
Functional mushroom supplements Dectin-1 recognition of fungal β-glucans, why the erinacines and hericenones of lion's mane come from different tissues, and the β-glucan versus α-glucan test that distinguishes fruiting body from mycelium on grain.
Adaptogens The Lazarev and Brekhman criteria, the stress-axis and Hsp70 mechanisms proposed for adaptogens, why extract standardisation determines whether trials can be compared, and the label-dose versus trial-dose test.
Functional beverages Why dissolved actives degrade faster than dry ones, the pH conflict between microbial stability and ingredient stability, oxygen ingress through packaging, and solubility and taste as dose ceilings.
Living culture beverages The kombucha yeast–acetic acid bacteria consortium, the cellulose pellicle, kefir grains and kefiran, and why ethanol and declining viable counts are the two recurring regulatory and quality problems.
Dealcoholised & non-alcoholic drinks Vacuum distillation, membrane separation and the spinning cone; limited-fermentation yeasts; ethanol's contribution to body, sweetness and aroma release; and the preservation hurdle its removal takes away.
Sports nutrition gels SGLT1 saturation and the glucose–fructose co-ingestion mechanism, why the 2:1 ratio exists, osmolality and gastric emptying, and what gut training does and does not change.
Probiotic confectionery Water activity as the master variable for microbial survival, why a fat-continuous matrix protects better than a sugar glass, the thermal windows of tempering and panning, and label counts at end of shelf life.
Functional chewing gum Partition coefficient as the controlling variable for release, buccal absorption and first-pass bypass, why xylitol is non-cariogenic at the level of bacterial metabolism, and chewing-rate variability as a dosing problem.
Toddler nutrition Why iron deficiency clusters in the second year, the mechanism by which cow's milk makes it worse, vitamin D and bone accrual, and the repeated-exposure basis of food acceptance.
Cycle-based nutrition products What ovarian hormones demonstrably do to resting metabolic rate, substrate use and body temperature; why iron is the strongest cycle-linked nutritional issue; and where phase-specific food prescriptions outrun the evidence.
Koji & solid-state starters Aspergillus oryzae on a solid grain substrate: why solid-state fermentation is a different process from submerged culture, the saccharification-then-fermentation sequence, and the domestication that removed aflatoxin production.
Home fermentation kits What domestic-scale fermentation loses relative to industrial: pH measurement, defined inoculum, temperature stability and surface-to-volume ratio — and how airlocks, weights, defined cultures and test strips substitute for each.
Home mushroom growing kits Spawn run and competitive colonisation, why substrate is pasteurised rather than sterilised, the environmental signals that trigger pinning, and contamination as the dominant failure mode.
Seaweed foods Three algal groups and their distinct hydrocolloids, alginate's egg-box gelation, iodine concentration as nutrition and hazard, inorganic arsenic in hijiki, and the free glutamate in kombu that identified umami.
3D food printing Extrusion rheology for food inks: shear-thinning, yield stress and recovery time, why printability and post-processing pull against each other, and the throughput limit inherent to serial deposition.
Deep grain processing Maize wet milling: steeping with SO2 and the disulfide bonds it reduces, density-based separation of germ, fibre, gluten and starch, and the three-enzyme conversion of starch to glucose and fructose.
Oils & fats processing biotech Enzymatic degumming with phospholipases, sn-1,3-specific lipases and triglyceride rearrangement, why partial hydrogenation created trans isomers, and structured lipids built by regioselective catalysis.
Sugar processing biotech Leuconostoc dextran formation in cut cane, why dextran wrecks crystallisation and viscosity, dextranase as the targeted fix, invertase losses, and raffinose in beet.
Coffee processing biotech Mucilage as a pectin gel and the pectinases that degrade it, washed versus natural versus honey processing, the contested contribution of fermentation to flavour, and what roasting chemistry actually does.
Tea processing biotech Why 'fermentation' is a misnomer for black tea, polyphenol oxidase acting on catechins after cell disruption, theaflavins and thearubigins, fixing as enzyme denaturation, and pu-erh as genuine microbial fermentation.
Wine microbiology & terroir Yeast succession and ethanol tolerance, malolactic conversion by Oenococcus oeni, Brettanomyces as a defined fault, and how much of the microbial terroir hypothesis the evidence actually supports.