A few more thoughts on gluttony...
If we compare the consumption of physical food to the consumption of "spiritual food" it is interesting to draw some parallels between our physical and spiritual health.
I didn't get into the whole topic of the kinds of foods we should eat versus the kinds of foods we shouldn't eat in my ramblings on gluttony. It is important, but I didn't go there. One of the points I wanted to make was that, for weight loss, added exercise doesn't usually help us if we don't have a change in our diet.
So it is spiritually. Doing good things, serving and performing other kinds of ministry are good. But they don't really help our spiritual health a whole lot if we are still consuming a steady diet of spiritual junk food: TV smut, pornography, celebrity gossip, soap operas, romance novels, pop psycology books, gossip with other people, music TV, advice from men's/women's magazines, or any other media that convey messages about our worth, value, meaning, or worldview that is different from God's word.
I'm not saying we can't "taste" SOME of these things so we at least know what the world is saying and how people who do eat these things up are affected, but they shouldn't be our "main course." Instead, it would do us well to have a steady diet of God's word and to help us understand God's heart and how to hear/listen to his voice.
Bearing good fruit without being deeply rooted in the Vine is very difficult to do.