Dr Bath's main research interest is the extent of iodine deficiency in UK pregnant women, and the effect that this may have on child neurodevelopment. Dr Bath currently sits on the committee of the UK Iodine Group, and on the Scientific Advisory Board of the World Iodine Association (WIA). 

Dr Bath's research areas include:

Iodine status of UK pregnant women and women of childbearing age

Effect of iodine deficiency during pregnancy on child cognitive development

Dietary sources of iodine in the UK diet

The effect of farming (organic or conventional) on the iodine content of UK milk

The interaction between selenium, iodine and thyroid function

Provision of dietetic resources on iodine for use by the public