A recent study published in Scientific Reports suggests a notable geographical link between global soil fertility and the average intelligence quotient of nations. The findings provide evidence that the nutritional quality of local soils might play an indirect role in shaping human cognitive development on a worldwide scale.

Human brain development relies heavily on adequate nutrition, particularly the intake of essential minerals and vitamins. Plants and animals absorb these nutrients from the earth, meaning human diets are deeply connected to the health of the ground beneath their feet. When soil lacks vital elements like iron, zinc, or iodine, the food grown in it tends to be nutritionally deficient. Deficiencies in these specific nutrients are known to negatively affect cognitive growth, especially in young children.

Zinc and iron are necessary for the central nervous system to build physical structures and produce the chemicals that allow brain cells to communicate. Severe or long-lasting dietary shortages can lead to persistent cognitive impairments and learning difficulties. ”