Singers create sound by using the abdominal and back muscles, the rib cage, lungs and the oral cavity, according to the book "Singing Secrets" by Kristina Seleshanko, an opera singer. The vocal chords, two small bands of tissue stretching across the larynx, coordinate with each breath to release a pitch by vibrating as air passes through. When vocal cords snap gently, a soft sound occurs; when they snap forcefully, a loud sound results. The faster the cords open and close, the higher the pitch produced. The vocal cords can be negatively affected by certain foods, which should be avoided by singers.
Heavy Meals
A heavy meal consisting of fried foods should be avoided prior to a performance, because it can upset the stomach causing gastric reflux. The stomach acids enter the esophagus causing irritation of the vocal cords, according to Karyn O'Connor, a vocal technique instructor. Heavy foods in the stomach make it harder to control breathing, vocal reach and projection, according to Vocalist.
Caffeine and Alcohol
Singers should avoid caffeine and alcohol and artificially sweetened beverages, according to David Otis Castonguay of Radford University. Hoarseness of the larynx or dryness of the throat may result after drinking significant amounts of one of these beverages. Vocal cords require moisture. Dehydration diminishes laryngeal lubrication and vocal cord wear occurs much more rapidly than normal.
Salt, Sugar and Spice
At times of extended vocal use avoid large amounts of salt and sugar, as well as spicy food such as Mexican, or Szechuan Chinese, according to David Otis Castonguay of Radford University. Excessive consumption and metabolism of these foods reduces the amount of water available to hydrate the voice.
Dairy Products
Dairy products do not harm the voice, but stimulate mucus production in the throat and sinuses, which muffles or distorts the voice. They should not be consumed in the two hours prior to singing. Some people are especially sensitive to dairy, especially asthmatics, according to Karyn O'Connor, a vocal technique instructor.
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