I'll sum up my whole arguement with two verses:
Romans 3:22-24
Ephesians 2:7-9
Eating too much can be damaging to the body. It is gluttony. That is why I used that example. It could be considered as a sin.
Telling other people about their sin is judging them. We are not to condem others, but to spread God's word. That word is not damnation, but salvation. I think sin is irrelevant with that. Faith is our key to salvation. Jesus associated with so many different people. Whores, tax collectors (who were considered scum lowest of the low at the time), leopers, etc. He taught about forgiveness to them, not about condemnation. As I stated in another thread, I do not believe Jesus would come and preach to people what they're doing wrong, but about love and compassion.
I urge you to check out the link in my signature.
