Recent concerns suggesting that plant-based milk lowers IQ have sparked public debate. However, health experts clarify that plant-based milk itself does not impair intelligence; the core issue is the risk of iodine deficiency when animal milk is completely replaced without adequate substitutes.
In countries like the UK, dairy milk is a primary source of iodine because the mineral is added to livestock feed. As consumers shift to plant-based alternatives—which typically do not contain iodine naturally—they inadvertently eliminate a major dietary source. Iodine is a crucial nutrient for brain development, particularly in fetuses and young children. Even mild iodine deficiency during pregnancy can adversely affect a child’s later cognitive and linguistic abilities.
Scientists emphasize that individuals can maintain brain health while consuming plant-based milk, provided they ensure sufficient iodine intake from other sources, such as iodized salt or fortified foods. The issue is one of nutritional balance rather than a direct negative effect of plant-based beverages.