Little Ice Age cooling contributed to vitamin D deficiencies and rickets in eighteenth‑century northern England

England is not typically associated with mild weather, but climate conditions a few centuries ago may have been harsh enough to jeopardize children’s health. A study of dental and skeletal remains from rural northern England reveals that during the height of the Little Ice Age, many children suffered from vitamin D deficiencies, sometimes progressing to rickets. Researchers reported the findings on November 5 in Frontiers in Environmental Archaeology.

The investigation focused on calcium deposition patterns in the teeth and bones of 21 individuals buried in North Shields between 1711 and 1829. When vitamin D is lacking, calcium does not fully mineralize in developing teeth, leaving characteristic defects. The team identified bands of incomplete mineralization, indicating seasonal spikes in deficiency. Several skeletons also exhibited clear signs of rickets.

Previous skeletal research has linked rises in rickets to the Industrial Revolution, when polluted, indoor urban environments limited ultraviolet exposure. However, North Shields was a small, pre‑industrial town, suggesting that factors other than urban smog contributed to the problem. The unusually cold climate of the Little Ice Age likely altered daily habits. colder temperatures may have driven residents to keep children indoors or heavily clothed, reducing skin exposure to sunlight and further limiting vitamin D synthesis.

Kendall, a bioarchaeologist at Durham University, notes that climate was only one piece of a complex puzzle. Gender roles, diet, and other environmental stressors also shaped vitamin D status in the period. “Humans are very messy to study,” she observes, “that’s one of the things that makes them so very fascinating.”

In summary, the intensified cooling of the Little Ice Age appears to have compounded vitamin D insufficiency and rickets among children in pre‑industrial northern England, highlighting how abrupt climate shifts can intersect with social and behavioral factors to affect public health.

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