Millions suffer from obsessive habits.

Anxiety and obsessive habits lead to an increased risk of heart attack

Many of us have found ourselves captivated by something at a certain time, but millions of people are literally overpowered by their obsessions.

"Obsessive Compulsive Disorder" is the most common mental illness after depression and around a million Britain's suffer from the condition.

A new BBC documentary takes a look at the darker side of this debilitating illness, and its roots in the brain's chemistry.

Dinah Lord produced the series for the BBC, and India Hailer used to suffer from the disorder. They both joined Jeremy and Sophie to discuss the condition.

Click here to do the BBC's Obsessive Compulsive Disorder self test.

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Obsessions TV Programmes:

Wednesday 7 August, 9-10pm: Who's Normal Anyway?

Wednesday 21 August, 9-10pm: Seeking Perfection