Dairy milk

Production method

How the drink is made

Raw milk is homogenised and pasteurised; the regimes are set by numbers

STUDY[5][6]

More detail

Industrial processing of drinking milk consists of two steps with stated regimes: two-stage homogenisation, which breaks up the fat globules and stops the cream separating, and heat treatment — HTST pasteurisation at 72 °C for 15 seconds or ultra-high temperature processing at 135 °C for 2 seconds. Both steps measurably affect the state of the whey proteins.

Quality indicators

How quality is judged

Somatic cell count is the internationally accepted indicator of milk quality

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More detail

Milk somatic cells are a mixture of secretory and immune cells; their count is used worldwide as an index of udder health and milk quality. It depends on the animal's productivity and health, stage of lactation, breed, housing conditions and stress, while hygiene and nutrition reduce it. Milk with a low cell count yields products with a longer shelf life; measurements on a large herd also link the indicator to composition, pH and coagulation properties.

Composition

Protein content

Consistent ~3.3-3.5 g per 100 ml of complete protein across fat levels

STUDY[9][10]

More detail

Cow's milk provides a fairly stable protein level, roughly 3.3 to 3.5 grams per 100 millilitres, regardless of whether it is whole, semi-skimmed or skimmed, since fat removal does not change protein. About 80 percent is casein and 20 percent whey, both regarded as complete, highly digestible proteins containing all essential amino acids. USDA FoodData Central and Harvard list milk among common dietary protein sources, and the British Dietetic Association notes it also contributes calcium and B12 alongside protein. Because the value changes little between processing types and brands, a single approximate figure describes the category more reliably than for plant drinks.

Fortification

Calcium, iodine and B12 naturally present; vitamin D added in some countries

STUDY[11][12]

Qualitative characteristics

Flavour and aroma profile

An emulsion of known structure — the one plant drinks take as their model

REVIEW[13]

More detail

Animal milk is an emulsion with a studied structure and functional properties; it is precisely this that plant-based drinks reproduce as their model. That is what makes milk a convenient reference point in the comparison: its composition and behaviour are described in detail, whereas for the analogues the description is still incomplete.

Health-related indicators

Allergen context

Relevant to cow's-milk protein allergy and to lactose intolerance

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More detail

Dairy milk is relevant to two distinct conditions that are often confused. Cow's-milk protein allergy is an immune response, most common in infants and young children, and can be serious. Lactose intolerance is a non-allergic digestive difficulty from reduced lactase enzyme, causing bloating or discomfort but not an allergic reaction; lactose-free milk, where the sugar is pre-split, addresses it. NHS and EFSA list milk among the major allergens that must be declared on labels. Both conditions are common reasons people limit or avoid dairy, and neither is resolved simply by choosing a lower-fat version of cow's milk.

Health-evidence status

Extensive but genuinely mixed and contested across outcomes and populations

STUDY[17]

Consumer experience

Packaging

Bottles, cartons, sometimes glass; HDPE jugs among more recycled plastics

STUDY[20][21][22]

More detail

Dairy milk uses varied packaging, plastic bottles, cartons, and in some markets glass or pouches, so its packaging footprint also resists simple summary. Refrigerated distribution and shorter shelf life can favour returnable or recyclable formats in some systems, while chilled transport adds energy elsewhere. The US EPA reports that HDPE milk jugs are among the more widely recycled plastics, though rates vary by region, and the Ellen MacArthur Foundation stresses reuse and material recovery over format debates. Robust, like-for-like life-cycle comparisons separating packaging from milk production are limited, so confident rankings of dairy packaging against alternatives are not well evidenced.

What is nearby

Sources and evidence