Oscar Pistorius’ defence team has questioned a pathologist’s finding that his girlfriend had eaten less than two hours before he killed her.
This contradicts the athlete’s account that the pair had been in bed for several hours before the shooting.
On Monday Mr Pistorius vomited as he listened to the medical testimony.
The Paralympic athlete, on trial for murder, denies intentionally killing his girlfriend Reeva Steenkamp and says he mistook her for a burglar.
On Monday, pathologist Gert Saayman told the court that Ms Steenkamp had been shot three times, in the head, hip and arm.
Judge Thokozile Masipa has ruled that Tuesday’s post-mortem examination testimony could be tweeted but not broadcast live.
The judge had banned live twitter coverage of Monday’s testimony because of its graphic nature.
Mr Pistorius has appeared distraught as the events of 14 February 2013 have been recounted in the court in Pretoria.
The state is seeking to convince the court that Mr Pistorius and Ms Steenkamp, a 29-year-old model, reality TV star and law graduate, had an argument before the athlete fired the shots that killed his girlfriend.
There are no juries at trials in South Africa, and his fate will ultimately be decided by the judge, assisted by two assessors.
If found guilty, the 27-year-old, a national sporting hero dubbed the “blade runner” after having both lower legs amputated, could face life imprisonment.