German news agency DPA said the man also ate body parts belonging to one of the teenagers killed in the town of Bodenfelde. Court spokesman Tobias Jakubetz told DPA on Friday that the defendant had admitted to cannibalistic acts.
In late November, 26-year-old Jan O., confessed to the murders of two Bodenfelde teenagers: Nina, 14, and Tobias, 13. Their bodies were found in a wooded area on the outskirts of the town.
The court spokesman said the man charged with the murders bit a wound on the female victim's neck after she was killed. The defendant also allegedly admitted he attempted to bite off the girl's toe.
Jan O. said he had wanted to attack Nina sexually but had murdered her when she screamed and defended herself.
The killer choked Nina near her home on November 15, before dragging her to a nearby wood, where she was kicked, struck with a full beer bottle and stabbed to death in the throat.
Five days later, 13-year-old Tobias was murdered. The court said the killer initially mistook the victim for a girl before taking Tobias to the same wooded area, strangling and stabbing him to death.
A psychological evaluation of the defendant found that suspect Jan O. was mentally unstable at the time of the murders and speculated that the motive behind both killings was sexual in nature.
The trial against Jan O. begins on Wednesday in Göttingen. Due to the gruesome nature of the crimes, a large part of trial could take place in camera.