Most allergic reactions occur with rashes and trouble breathing.
For example, people who have anorexia severely reduce their food intake to lose weight. People who have bulimia eat an excessive amount of food in a short period of time, then purge or use other methods to prevent weight gain.
27 percent i heard but i wouldn't count on it
So the enzymes in your stomach are most likely there to help you disguest your food. Also they make sure everything is good in your stomach.