Vocal health might be a somewhat unglamorous list of dos and don'ts, but it is a major part of being a good singer.  
John explains key points you need to know to keep yourself healthy and to make sure your voice lasts. Understand key foods, medications, and lifestyle choices that can create serious problems for the singer.
No matter how good your vocal technique is, if you don't stay healthy you will not be able to sing at your best.