Jesus said I am the bread of life which came down from Heaven' and they murmured. He also told the disciples to be part of Him they should eat of His flesh and drink of His blood.

Because Jesus was sent by His Father to preach the gospel and to teach those who would listen the truth. Evon though the world hated Him, He had to fulfil the work He was sent to do including healing and casting out demons. I think one of the things Jesus was most hated for was casting out demons, the pharisees said He got his strength and power from satan.