Geochemistry and human selenium imbalances in China
October 1997
TLDR Selenium is essential but can be harmful in excess, and China struggles with balancing its levels for health.
The document discussed the role of selenium (Se) in human health in China, highlighting its necessity in small doses and toxicity in excess. It noted that China had extensive epidemiological data linking Se deficiency to diseases like Keshan Disease, Kashin-Beck Disease, and oesophageal cancer, while excess Se caused hair loss and nail deformation. Despite this, the specific geographic areas at risk and the geochemical factors affecting Se levels were not well-defined, and effective remediation strategies had not been established.