Choosing milk used to be fairly straightforward. Now the dairy case includes cow’s milk, soy milk, oat milk, almond milk, rice milk and other plant-based drinks, each carrying its own mix of nutrition claims, health halos and personal values.
A new narrative review from researchers at Edith Cowan University and published in Food Science & Nutrition argues that cow’s milk may have advantages that go beyond its individual nutrients because of what researchers call the “milk matrix,” or the natural structure that packages milk’s proteins, fats, vitamins, minerals and bioactive compounds together. But the review was supported by Global Dairy Platform, a dairy industry organization, and should be read with that context in mind.
The review does not prove that cow’s milk is the right choice for everyone, nor does it show that all plant-based milks are nutritionally inferior. Instead, it highlights a more useful point for consumers: cow’s milk and plant-based milk alternatives are not automatically interchangeable, especially when it comes to protein, calcium, vitamin B12, iodine and how nutrients are absorbed and used by the body.
“Milk is more than just calcium, protein and fat — it’s a complex whole food, and how its nutrients are packaged together is more important than initially thought,” Associate Professor Therese O'Sullivan said.
According to the review, cow’s milk contains more than 100 nutrients and bioactive substances arranged in a natural physical structure. Researchers argue that this structure may influence digestion, nutrient absorption, blood sugar response after a meal, cholesterol effects and the gut microbiome.
That idea is part of a growing area of nutrition science focused on food matrices, or the way nutrients behave inside whole foods rather than as isolated ingredients. In other words, two products can list similar nutrients on a label but still differ in how those nutrients are delivered.
The review points to evidence linking regular milk consumption with stronger bones and lower fracture risk. It also notes that calcium supplements have shown mixed results in studies and, in some cases, have been associated with higher heart disease risk among older women.
That does not mean calcium supplements are harmful for everyone or that milk is the only way to support bone health. It does suggest that getting nutrients from foods may not always have the same effect as getting them from isolated supplements or fortified products.
Plant-based milks complicate the picture because they are not one category. Soy milk typically provides more protein than almond, oat or rice milk. Some products are fortified with calcium, vitamin D or vitamin B12, while others are not. Some contain added sugars, oils or stabilizers for flavor and texture, while others are much simpler.
That means a person switching from cow’s milk to a plant-based option may be making a small change, a major nutrition change or something in between depending on the product.
The review raises particular concern about children, who have higher needs for growth and development. Dr. Analise Nicholl said dairy-free diets can create nutrient gaps if they are not carefully planned.
“There is a common perception that plant-based drinks are automatically healthier, but that’s not always the case,” Nicholl said.
That warning is worth taking seriously, but it should not be read as a blanket argument against plant-based milks. Children who cannot drink cow’s milk because of allergy, intolerance or family dietary choices can still meet their nutrient needs, but parents may need to pay closer attention to protein, calcium, vitamin D, iodine and vitamin B12.
Adults also choose milk for many reasons beyond nutrition. Lactose intolerance, dairy allergy, taste, cost, culture, ethics and environmental concerns can all play a role. A nutrition label cannot answer all of those questions.
For someone using milk as a major protein source, almond or rice milk may not be an even swap. For someone looking mainly for a splash in coffee, the difference may matter less. For a child who drinks several cups a day, the nutrient profile matters much more. For someone avoiding dairy, a fortified soy or pea-based drink may come closer nutritionally than many lower-protein plant-based options.
The review also shows why nutrition claims can get confusing. “Plant-based” does not automatically mean more nutritious. “Fortified” does not always mean identical. “Natural” does not automatically mean better for every person. And “milk” on a carton does not mean every product functions the same way in the diet.
For shoppers, the best starting point may be simple: compare the protein, calcium, vitamin D, vitamin B12, iodine, added sugar and ingredient list. Then consider how often the milk is used and who is drinking it.
Cow’s milk can be a nutrient-dense choice for people who tolerate it and want it. Plant-based milks can be useful and appropriate for many people, especially when chosen carefully. The mistake is assuming they are all nutritionally the same.
The review was supported by Global Dairy Platform. The authors reported that they maintained control of the research and manuscript. Associate Professor Therese O'Sullivan has previously received travel support or honoraria from Dairy Council for Northern Ireland, Dairy UK and Dairy Australia, and previously had a study funded by the Dairy Health and Nutrition Consortium.