Apple With Peanut Butter. In a good diet for exocrine pancreatic insufficiency, it's still okay to eat a little saturated fat, as long as it's in moderation. An easy and filling snack idea is to cut an apple into slices and dip them in a tablespoon of peanut butter.atmeal With Nuts. If you have exocrine pancreatic insufficiency, you may want to start your day with a bowl of oatmeal. Prepare one-half cup of rolled oats with fat-free or low-fat milk â a good source of vitamins A and D, which protect the immune system and help maintain strong bones.