Vasopressin has three main effects: 1  Increasing the water permeability of distal convoluted tubule and collecting duct cells in the kidney, thus allowing water reabsorption and excretion of more concentrated urine, i.e., antidiuresis.
It can be caused by damage to the vagus nerve, which regulates the digestive system. A damaged vagus nerve prevents the muscles in the stomach and intestine from functioning, preventing food from moving through the digestive system properly. Often, the cause of gastroparesis is unknown.
A change in your diet can cause stomach pain for a variety of reasons. Indigestion, too much or too little fiber, food intolerance or food allergy can result in digestive distress and can occur when the foods you eat are different than the ones you are accustomed to.