Food is pushed through the esophagus and into the stomach by means of a series of contractions called peristalsis. Just before the opening to the stomach is an important ring-shaped muscle called the lower esophageal sphincter (LES). This sphincter opens to let food pass into the stomach and closes to keep it there
It means you probably have a lack of vitamins consumed. You might wanna try eating healthier and eating items from the food pyramid to balance out your diet.
