Before we get to specifics of actual sound levels, let's consider a more foundational perspective first. In many of His parables, Jesus talked about stewardship. He refers to us as stewards and that God has entrusted us with His possessions. If you understand the full ramifications of this, then one of the things over which we are to exercise stewardship is our physical bodies. The Apostle Paul elaborated on this idea when he said, "Do you not know that you are God's temple and that God's Spirit dwells in you? If anyone destroys God's temple, God will destroy him. For God's temple is holy, and you are that temple" (1 Corinthians 3:16-17). Paul also shared the same idea in a bit different way later in the same letter, "Or do you not know that your body is a temple of the Holy Spirit within you, whom you have from God? You are not your own, for you were bought with a price" (1 Corinthians 6:19-20).
From an honest scriptural perspective, our physical bodies belong to God and therefore, as stewards, we are required to take good care of them. As a result, more and more Christians today are recognizing the need to eat properly and to maintain a healthy lifestyle. These are obvious things when we recognize that our bodies belong to the Lord and we are to be good stewards of them.
The flip side of this should be obvious. As Christians who recognize our mandate to be good stewards of God's property, we should not smoke three packs of cigarettes a day for the rest of our lives. Medical evidence demonstrates that this is extremely unhealthy. We also should not eat only foods that have little or no true nutritional content. Again, this is verifiably bad for us. From a scriptural perspective, it's all about stewardship.