Oh ok. As I understand it, the prophecy initially relates to the Jews rebelling 40 years from Jesus’ death. The Romans held the city to a siege, where its reported that the Jews starved and (I’m sorry this is grim but relates to your query) some ate their own children. When the Romans finally broke through, they destroyed the city and the temple. 1.1 million Jews died.

Jesus was warning them of the horror that was to come, including that children would starve or would erm, not .

Many Christians listened to the prophecy and left the city in time.