These images taken during the autopsy of an obese person show the strain put on the body by carrying excess weight.
The woman, who was in her 60s from Long Beach Island in California, was around 5 foot 5 inches tall and weighed 17 stone.
She fell into the morbidly obese weight category. She donated her body to medical research.
She died of heart failure.
Her flesh was difficult to cut due to thick yellow fat.
Carla Valentine, technical curator of the museum of pathology at Queen Mary University, said: ‘I needed a lot more strength to cut through the tissue which kind of bloomed out in neon yellow.
‘It made me aware of the fat on my own body and the effect it has.’
Giles Yeo, another pathologist, added: ‘The amount of fat you can see tells you how likely the fat is to be doing damage elsewhere.’
Images show her ‘baggy’ heart, the pathologists noted her heart weighed 449 grams, which is twice the size of what would be considered healthy for somebody of her petite height.
The woman’s liver was also damaged, instead of being soft it was more meaty due to fat.
Obesity – The Post Mortem is due to air on BBC Three on 13 September from 10am.