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 Iodine is added to table salt because deficiency causes such serious mental and physical problems.

 Chromium, manganese and probably vanadium (as well as zinc) are needed for blood-sugar regulation, and lack of them is often linked with mood swings, inattention and carbohydrate cravings.

 Cobalt is involved in nervous function because it’s needed for vitamin B12.

 Selenium is important for immune function and antioxidant defences, but soil levels in Europe are low, reducing the content of locally grown produce.

 A fascinating study in Texas showed that areas where lithium concentrations in the drinking water were highest had the lowest incidence of suicide, rape and murder. Higher doses of lithium have long been used to treat bipolar depression, but the Texas study suggests that even very low doses can affect human behaviour.³⁹