We have an expression in the south, “Chewing the fat”. Fat is often the source of the best flavor, and it generally sticks around for a while like bubble gum. However it really doesn’t have much (if any) nutritional value. So to chew the fat is to partake in something that is enjoyable, but ultimately contains no nutritional value.
Now some chewing of fat is a good thing. The problem comes in, however, when we think what we are chewing on is not fat.
Im most churches today I would wager that members are chewing the fat. They attend bible studies that have little to no nutritional value. But since they often have excellent spiritual flavor, emotional experiences, superficial intimacy among participants, etc. they are not generally known for what they are.
Not even milk. Just fat.