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Cases of type 2 diabetes in people under 40 have almost trebled in the last 20 years, according to research by Cardiff University. Professor Craig Currie, who led the study, says it's because we're "a nation of lazy porkers". Why has this happened?

Is this all our own fault? Is this down to a lack of self-control? Are we failing to take responsibility for our own health?

Or is the food industry to blame? Is sugary food too cheap, too available? Is it marketed too aggressively?

Why are we "a nation of lazy porkers"? Nicky Campbell takes your calls.