The Importance of Transsubstantiation in the Christian Church

For the majority of Christian history Christians believed that when they received the Eucharist they were receiving the body blood soul and divinity of Jesus Christ. This is something that Francis Chan recently spoke openly about which caused a lot of waves I know in the evangelical world where he was kind of rattled by that. How can we understand like how does it actually turn into because it still looks like bread still tasteslike wine so like what yeah totally.