You can stop the rapid aging of your digestive function by eating foods that can partially break down indigestible cellulose instead of eating foods, supplements, or enzymes that quicken the digest of carbohydrates into simple sugars. Keep away from supplements full of amylase or 'oligosaccharidases.' Instead, you want fiber-digesting enzymes, and foods that help you digest fiber, foods containing enzymes such as cellulase, hemicellulase, phytase, beta-glucanasse, pectinase, and xylanase.
These fancy words are all enzymes that can help digestion without that sudden surge after eating in sugar/glucose in your bloodstream. That's why a lot of people who keep having acid reflux feel better when they eat a bowl of chopped raw green leafy vegetables that are not full of starches or drenched in fats, cheese, nuts, and oils.
For those who eat few carbs, the body still has enough glucose because the liver can convert protein and fatty acids into glucose/sugar through the process of gluconeogenesis. People who take a supplement of digestive enzymes with protease and lipase that have specialized cellulases are able to use those enzympes to digest amino acids, plants, and fat-soluble nutrients without getting those high glucose/sugar spikes in the bloodstream.