Why it might be a good idea to add lithium to tap water

Adding lithium to drinking water supplies might be a valuable public health measure to reduce the incidence of dementia, Australian psychiatrists say.

Professor John McGrath and Professor Michael Berk say the mood stabilising element is increasingly being linked in epidemiological studies to preservation of cognitive function and lower levels of Alzheimer’s disease.

Writing in JAMA Psychiatry, they suggest lithium fortification of water could be a safe, simple and cheap public health intervention.

But they need to be confident that any putative benefits