(Pro 18:20 KJV) A man's belly shall be satisfied with the fruit of his mouth; and with the increase of his lips shall he be filled.
What we say makes a difference. How we say it makes a difference. What we really mean makes a difference. Communication is important. I think that is the main point underlying this verse. The focus seems to be on our own lives but I think the principle can be outward mobile also.
So? Let the products of our mouths be vitamins and minerals, not just empty calories.