Nim: Why am I on this stupid diet? It's not like it's a sin or anything to be fat!
Abby: Maybe it's not a sin, but it shows ingratitude to God for his gift of life. Plus, our bodies are the Temple of the Holy Spirit and should be kept as pure as possible.
Nim: Don't argue with me today, fuzzball! I may be small, but I'm hungry!

Look at what you do to excess and ask, "Is this interfering with my relationship with God?"