When diving doubles you will need to use your wing/BCD to compensation. Typically you can't control your buoyancy only with a drysuit with steel doubles and stage bottles so you will need to use your wing to offset buoyancy.
The structure of the throat is designed to prevent food from entering the lungs. Photo Credit matthewennisphotography/iStock/Getty Images. When food enters the lungs instead of the esophagus, it affects breathing and can cause choking and other problems.
Your stomach squeezes your food with muscular contractions, while it is squeezing, tiny glands in your stomach produce enzymes and acids which work together to break your food to nutrients. The stomach acid also kills bacteria that might come in through your mouth. Your stomach mixes and squeezes your food for a couple of hours until turns into chyme