Metabolism and diet are linked to root of bipolar depression, say researchers

Illness could be treated as a physical, rather than mood, disorder, according to scientists in Edinburgh

Iain Campbell, a researcher based at Edinburgh University, has a special perspective on bipolar depression. He lives with the condition and has lost family members who have taken their own lives because of their depression. It remains an intractable, devastating health problem, he says.

More than a million people in the UK have bipolar depression, of whom a third are likely to attempt suicide. Yet the condition's roots remain unknown - despite significant efforts to understand them.