With almost three quarters of British adults likely to be overweight or obese in less than 20 years, obesity is a significant problem showing no signs of slowing. There is plenty of focus in today’s world on how people look, but as the programme demonstrates it’s also about what’s happening to our insides - it’s the fat we can’t see that’s killing us.

It’s a medical area about which there is relatively still a lot to learn. Accompanying the film will be extra content delving further into the world of pathology and going behind the scenes on the UK’s first post mortem, specifically aiming to uncover the internal effects of obesity on the body.