If you've honestly wondered what a healthy weight for you is (instead of looking at Hollywood models as your standard), then you know about the Body Mass Index. Basically, it checks to see if your height and weight are in proportion as a means to measure body fat and assigns you to a category of underweight, normal, overweight or obese (don't you just love labels?).
The Bible tells us that to whom much is given, much is required. Some Christians take in lots of spiritual "food". They go to church, Bible study, Christian fellowship and more. They just soak in and accumulate knowledge. But they never seem to grow taller to balance out the "weight". They have too much spiritual body fat and no spiritual muscle to carry out the truth they know.
Other Christians take in little food. They skip devotions and church often and pray only during a crisis. This kind of nourishment results in an anorexic faith. Sooner or later, if left untreated, anorexia can be fatal. So can a spiritual life with no nourishment.
So what do people of "normal" spiritual weight look like? I believe they take in quality nourishment instead of spiritual "junk food". I think they participate in "strength training" on their knees daily. I believe that they exercise God's love to others by ministering to them. They take in and grow tall all the while not focusing on themselves and how they "look" but doing all for the glory of the only One they hope to please.