What alternative protein is

Readers already working in this field can skip to chapter 2. Everything here is standard background, not a finding of this study.

The four families this report covers#

Alternative protein is protein for food or animal feed made without raising and slaughtering an animal for it. The familiar version is tofu. The versions in this report are newer and are made in factories rather than fields.

1. Fermentation-derived protein. Fermentation means growing microorganisms, such as yeast or fungi, in a tank, feeding them sugar or starch, and harvesting what grows. It is the same basic operation used to brew beer, make monosodium glutamate or produce baker's yeast. It splits in two:

Biomass fermentation grows the microorganism because the microorganism itself is the food. You grow fungus, dry it, and the dried fungus is roughly 40 to 60 percent protein. The best-known product is Quorn. This is the cheap, bulk, industrially mature end of the field.
Precision fermentation uses the microorganism as a factory rather than as the food. The organism is genetically modified to manufacture one specific protein, usually one that normally comes from an animal, such as a milk protein or the heme molecule that makes a plant-based burger taste bloody. The organism is then discarded and the protein kept. This is expensive, technically demanding, and where most of the industry's attention and money currently sit.

2. Novel plant-based protein. Protein extracted from a plant and purified into an ingredient, the way soy protein isolate is made from soybeans. "Novel" here means either a plant nobody has industrialised yet, or a new way of extracting protein from a plant already grown at scale. Ordinary tofu and existing veggie burgers are outside the scope.

3. Cultivated meat. Animal muscle and fat cells grown in a vessel rather than in an animal. Sometimes called cell-based or lab-grown meat. This report looks at it only to judge whether Vietnam should enter later, because no Vietnamese company works on it today.

4. Feedstocks. Not a protein category, but the input the other three run on. A feedstock is whatever the microorganism eats, or the crop the protein is extracted from. Which feedstocks a country has cheaply and in quantity largely determines which protein categories can work there. A large part of this report is a map of Vietnam's.

The vocabulary#

These twenty terms cover almost everything technical that follows.

Term	What it means
Feedstock	What the process eats: sugar, starch, a crop residue, or a gas
Substrate	The same thing, seen from the microorganism's point of view
Side stream	A by-product of processing something else, such as the pulp left after starch is extracted from cassava. Also called a residue
Submerged fermentation	Growing microorganisms in liquid in a sealed tank. The standard industrial method, and the one Vietnam has almost none of
Solid-state fermentation	Growing them on damp solid material instead, as in traditional soy sauce making. Cheaper, harder to control
Bioreactor / fermenter	The tank. Size is quoted in litres or cubic metres. 1 cubic metre is 1,000 litres
Working volume	How much liquid is actually in the tank, always less than the tank's nominal size
Titer	How much of the target protein you get per litre of liquid, in grams per litre. The single most important number in precision fermentation
Biomass	The total dry weight of organism grown, in grams per litre
Yield coefficient	Grams of organism grown per gram of sugar fed. Higher is better
Hydrolysis	Breaking starch or plant fibre down into simple sugars the organism can eat, using enzymes, acid or heat
Pretreatment	The extra step needed before hydrolysis when the material is woody, as rice straw is. Expensive
Lignocellulosic	Woody. Rice straw and sugarcane bagasse are lignocellulosic and therefore expensive to convert
Downstream processing	Everything after the tank: separating, drying, purifying. Often the majority of the cost
Chassis	The microorganism used as the production host in precision fermentation, usually a yeast
Crude protein	Protein content estimated from nitrogen content. Cheap to measure and a slight overestimate
DIAAS and PDCAAS	Two scoring systems for protein quality, both measuring how well a protein supplies the amino acids a human needs. DIAAS is the newer and better method. Around 100 on DIAAS, or 1.0 on PDCAAS, means "as good as animal protein"
Limiting amino acid	The one essential amino acid in shortest supply in a given protein, which caps its score. Cereals are usually short of lysine; legumes are usually short of the sulfur amino acids
Aquafeed	Feed for farmed fish and shrimp, as distinct from feed for pigs and poultry
Fishmeal	Dried ground fish, the traditional high-protein ingredient in aquafeed, and the expensive ingredient a new protein would displace
Novel food	A regulatory category, not a scientific one: a food with no history of consumption in that country, which therefore needs approval before sale. Vietnam does not have this category, and that fact drives most of this report

Three numbers that recur#

Fifty grams per litre. Published reviews put the titer needed for cost-effective food protein manufacture above 50 grams per litre. Every published food-protein titer found in this study is far below it. When this report calls precision fermentation immature, this is the number it means.

One to three US dollars per kilogram. The band a bulk protein has to reach to compete with commodity animal feed ingredients. Biomass fermentation has a modelled route into it. Precision fermentation is roughly a hundred times above it.

Ninety-eight and a half percent. The share of Vietnam's soybean supply that is imported. This is the food-security argument for the whole exercise.

How the evidence is labelled#

Every substantive finding carries one of three labels.

evidence about Vietnam specifically
evidence from a comparable Southeast Asian country, with the assumption behind the transfer stated
global or category-level evidence, with no claim that it applies to Vietnam

Vietnam-specific literature on these categories is thin. That is stated plainly throughout rather than covered over by presenting regional or global material as though it were Vietnamese. Clicking any label on this page dims everything not carrying it, which is the fastest way to see how much of a given chapter actually rests on Vietnamese evidence.

How to read the reference codes#

Open questions carry a topic prefix, so R-G1 is open question 1 on regulation and CF-G3 is open question 3 on crops and feedstocks. Places where published sources contradict each other use the same prefixes with a C, so NP-C1 is disagreement 1 in plant protein. The prefixes are R regulation, F fermentation, CF crops and feedstocks, NP plant protein, CS cultivated meat and cross-cutting questions.