Pepsin slows slightly imbalance. what should I consume to make it balance ? What foods should I avoid?

In order to rebalance pepsin, we have to first understand what it is used for.

Pepsin is an endopeptidase (enzyme) that breaks down proteins into smaller peptides. It is produced in the chief cells of the stomach lining and is one of the main digestive enzymes in the digestive systems of humans and many other animals, where it helps digest the proteins in food. Pepsin also works hand in hand with HCL. It may be that your diet is too rich in protein, or there is a tendency to over snack. Every time we come to ingest food the HCL and pepsin has to fire up and the overstimulation of eating constantly may be lowering the production of pepsin and HCL. It may also be due to historic diagnosed medical conditions from your medical professional. 

What to do about it: You may also wish to decrease your protein consumption by 10% and replace it with more vegetables/fruits or plant-based proteins which can be easier to digest. You may wish to increase your pepsin production by consuming apple cider vinegar 30 minutes before food (1 teaspoon of raw apple cider vinegar mixed with 3 tablespoons of pure alkaline water) which also has been known to kill off bacteria. You may wish to opt for a digestive enzyme containing pepsin.