Examining the Health Impacts of Plant-Based Milk Alternatives
Researchers at the University of Surrey have found that substituting cow’s milk with plant-based beverages may lead to iodine and other essential nutrient deficiencies. Published in The Lancet Planetary Health, the study highlights that even partially replacing dairy products like milk, yogurt, and hard cheeses with oat, soy, or nut-based drinks results in a decline in key nutrients, particularly among teenagers.
Key Findings from the Study
The analysis covered dietary information from over 3,500 individuals aged between 1.5 and 100 years, focusing on iodine, calcium, vitamin B12, and riboflavin levels. The research revealed that replacing just 20–35% of dairy intake caused nutrient reductions. Specifically, iodine deficiency among adolescent girls increased from 54% to 65% with partial dairy substitution, and soared to 80% when dairy was fully eliminated. Plant-based milk alternatives typically contain minimal iodine unless artificially fortified.
Iodine is critical for thyroid hormone production, metabolism regulation, and brain development. Deficiency poses significant risks, especially for teenagers and pregnant women. To address this, scientists recommend mandatory iodine fortification of plant-based drinks as well as enriching bread and baked goods. Consuming iodine-fortified bread alone could reduce iodine deficiency in teenage girls to 37%.
Sara Bath, one of the study’s authors, emphasized: "Consumers often underestimate cow’s milk as a primary source of iodine with high nutritional value."
This research sheds light on the nutritional consequences of shifting towards plant-based milks, particularly for vulnerable populations like adolescents and expectant mothers. With the growing popularity of plant-based diets worldwide, the findings underscore the importance of carefully managing dietary changes to prevent critical micronutrient shortages. The authors advocate for integrating iodine enrichment into everyday foods to support public health outcomes.
While the study from the University of Surrey highlights the nutritional risks associated with plant-based milk substitutes, another recent research from Canada indicates that regular consumption of whole milk may actually benefit cardiovascular health. Specifically, findings show that daily intake of whole milk can lower blood pressure without raising cholesterol levels. To explore this connection further, you can read about the health advantages of whole milk here.