It is the closest to Christ physically and spiritually you can be. It provides strength for the journey. It is the Body, Blood, Soul and Divinity of Jesus Himself.
And since you refuse anything provided to you:
The key term here is “union” or “unity,” and so you can think of the Eucharist as a sacramental communion with Jesus Christ that profoundly deepens our unity with him and each other as members of his Church. In receiving the Holy Eucharist and saying, “Amen,” Catholics reaffirm our belief in—and renew our union with—Christ, his Church, and all the teachings Jesus gives us through his Church. So to receive the Eucharist, you are to fully agree with all the Church’s teachings, even if you’re struggling with that belief (see Mark 9:21–29). Jesus Christ himself gives us these teachings, so it is important to be in harmony with them.