This week's programme in the series on Man and Science Today.
In the 24 hours that make up this Monday, about 620 people in these islands will die of heart disease. The figure for the equivalent Monday in January 1900, even allowing for the change in the size of the population, would have been half that. Over the last 70 years heart disease has become an epidemic.
Something must have changed: perhaps it's our habits or perhaps it's in our environment. What has changed, and what we can do about it, is what this programme sets out to discover.