A study into the health of children in Hartlepool says a quarter of 4 to 5 year olds in are obese. Ali asks - Why?

A quarter of 4 to 5 year olds in Hartlepool are obese. That’s the finding of a study into health of children there. We’ll report from a school in the town.
And we’ll hear how people in Stockton are being given the chance to enjoy a cuppa..and lecture on science.