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We all know what fat looks like on the outside of our bodies. But do you understand what an unhealthy diet and lack of exercise could be doing to your inside?

Tonight you have the chance to find out, as BBC Three broadcasts a post-mortem examination of an obese woman whose body was donated to medical science.

It may attract controversy, but this groundbreaking documentary offers a graphic wake-up call for a society apparently sleepwalking towards a growing obesity crisis, with one in four adults in the UK now obese.