Walking through the dairy section, it’s easy to assume that milk and plant-based alternatives are more or less interchangeable. The labels on oat, almond, and soy beverages often list added calcium, vitamin D, and other nutrients, making their nutritional profiles look strikingly similar to those of cow’s milk.
A new Australian study argues that these labels don’t tell the whole story. Researchers say the health benefits of milk come from more than just the nutrients it contains. The findings were published in the journal Critical Reviews in Food Science and Nutrition.
Experts contend that milk’s natural arrangement allows these nutrients to interact in ways that fortified plant-based drinks cannot fully replicate.
The study was led by Professor Theresa O’Sullivan at Edith Cowan University (ECU) in Western Australia.
At the heart of the comparison lies a concept scientists call the milk matrix—the natural structure that binds together fats, proteins, minerals, and over 100 active compounds in milk. This arrangement appears to influence how the body processes food.
This same structure affects how quickly blood sugar levels rise after drinking a glass, how fat impacts cholesterol, and which microbes thrive in the gut.
“Milk contains a natural set of nutrients that work together as a complex,” O’Sullivan said.
Where milk most clearly excels over other products is in strengthening the skeleton. Regular consumption is linked to stronger bones and fewer fractures.
The review notes that consuming one to two cups of milk per day can reduce the risk of fractures by up to 43 percent. Calcium supplements, long used as a stand-in for dairy, have not provided the same reliable protection. Some studies have even linked high doses to an increased risk of cardiovascular disease in older women.
According to the researchers, calcium from food behaves more gently than calcium taken alone. Thanks to the presence of protein and phosphorus, it is well absorbed and does not cause the cardiac side effects seen with high doses.
Bones are only part of the story. The same package appears to stabilize blood sugar after meals and channel cholesterol in a beneficial direction—something that cannot be confidently said about isolated, packaged nutrients.
Milk also nourishes the gut microbiota—the vast community of microorganisms in the digestive tract that helps sustain bodily functions. Compounds in dairy seem to promote the growth of beneficial bacteria. This activity may be linked to several health connections that researchers keep uncovering.
Saturated fat is another long-standing concern with whole milk. Within its natural structure, however, these fats behave differently. The review indicates that it does not increase the risk of cardiovascular disease in the same way as the same fat does after processing.
Plant-based milks rarely contain the same nutrients as dairy, so these are added through fortification. The body does not always absorb these added forms well. Many cartons also include added sugar, oil, or thickeners to improve taste and texture.
Plant-based beverages still have value, and soy beverages have shown an ability to lower cholesterol and provide anti-inflammatory effects in adults.
A study in Australia found that most plant-based drinks sold in local stores are not fortified with nutrients such as iodine and vitamin B12.
This issue is particularly pressing for young children. Dr. Analise Nicholl, who worked on the review, warns that cutting out dairy without careful planning can lead to real nutritional deficiencies during the years when growth depends on them.
Primarily, this means losing protein, calcium, iodine, and vitamin B12. Nicholl warns that without these, children become vulnerable to conditions many associate with another era—rickets, goiter, scurvy, and stunting from malnutrition.
And yet, milk is not a perfect option. Very large amounts—around a liter per day—can displace iron and contribute to anemia in toddlers.
Dairy products change their properties when microbes come into play. Fermented foods like yogurt and cheese offer benefits beyond those of plain milk, thanks to compounds produced by their live cultures during fermentation.
These byproducts appear to soothe inflammation and promote a healthier composition of gut flora. A growing body of research links regular yogurt consumption to a lower likelihood of developing type 2 diabetes and cardiovascular disease.
Cheese tells a similar story. Its dense structure alters how the body releases and absorbs fat. Some studies suggest that cheese, despite its high saturated fat content, fosters a beneficial gut microbiome.
In the end, the review arrives at a simple conclusion: whole foods are better than their processed components. Calcium and protein embedded in milk’s natural structure offer more benefits to the body than the same nutrients in pills or fortified products in a carton.
This could shift how dietary guidelines are crafted. Instead of chasing individual nutrients, the authors support a food-first approach that emphasizes whole foods over supplements and processed substitutes. They argue that this perspective could help clinicians develop more effective dietary recommendations.
The team acknowledged that the study has limitations. The research was supported by a dairy industry organization, and the lead author reported past funding from groups linked to the dairy industry.
Independent research should verify just how large this advantage is. Still, the case for viewing milk as a complete food has never been clearer.
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