I don't think it was intended to be funny, in fact I think he was dead serious, but a guy writing for The Resurgence ("John Catanzaro N.M.D. - Doctor of Naturopathic Medicine") is doing a series on preserving the preachers voice.
John needed to be in great health to have the energy in spirit, soul, and body to herald this world-changing event. The world was never the same after John proclaimed Jesus as the answer to all of the world's conflicts. He required nutritious and sustaining food for this athletically demanding message. Preacher, so do you!
No way would your pastor agree to eating bugs and honey as a main staple of his diet before preaching, unless there was some odd behavioral thing going on. Well, John didn't either. According to some New Testament experts, John's diet in the rough and arid terrain consisted of dates, date honey, and bread cakes that were made from the bean of the locust tree. This seems to make more sense. This diet would provide immediate energy to meet the exhausting task of preaching to the masses the message of the Messiah.
Interesting, because the Bible specifically says that John ate honey and locusts (Matthew 3:4; Mark 1:6), not bread made from the bean of locust trees.
I would recommend that the first thing a preacher concerned about burning out his voice should do is to allow the rest of the men in the church to speak. If you don't do all of the speaking, you are in less danger of losing your voice and if you do lose your voice, the other men will carry on without you.