I would recommend the following as a guide to preserving the enzyme potential and placing less of a burden on the digestive system as well as the rest of the body.
Do not overeat. Just eat enough to satisfy you.
Eat less high calorie foods containing sugar and fat. Eat less refined foods and man made foods. Increase intake of raw fruits and vegetables.
Avoid foods which you like but you know don't agree with your digestive system.
Consider combining your foods so that concentrated starches and proteins don't mix at the same meal. This takes away much of the effort of digestion.
Drink plenty of water. Ideally drink half a pint of water about half and hour before meals. Water is important in the digestive process and helps metabolic enzymes function more efficiently.
By taking all these measures, enzymes will be preserved, the digestive system will have a great load taken off it, and every cell in the body will have its burden eased.
About the Author
The writer manages an holistic medicine website for London, UK. It encompasses london osteopathy and london psychotherapy plus many other therapies as well as articles on nutrition.