Diastase was the very first enzyme discovered. Its founders were Jean-Francois Persoz and Anselme Payen, workers in the French sugar factory where the enzyme was extracted from a malt solution in 1833. This enzyme helps break down carbohydrates and turn them into sugar, which makes them easier to digest.

In modern times, diastase can be extracted from a barley seed after the ingredients of beer are all mashed up together and heated. The enzyme causes starch from the seed to form into a soluble sugar, which allows the pod to pull apart from the seed. The enzyme can also be found and extracted from sources such as milk, saliva and other plants. As a natural enzyme, diastase can be extracted rather easily from many natural sources.

Amylase and glucoamylase are the enzymes found in human saliva that help break down carbohydrates into sugar so they can be digested. While this enzyme is present in saliva, some people may not produce enough to regulate the breakdown of foods correctly. Diastase helps this process, as it is a natural form of amylase. Typically, malt diastase is taken as a supplement for easier digestion of starchy foods such as potatoes, carrots, broccoli, cauliflower and grains. Some tests indicate that those who may benefit from diastase include individuals with digestive disorders, those looking for help losing weight, and people in the early stages of diabetes, but these statements have not been endorsed or approved by the US Food and Drug Administration (FDA).

Another use which has been found for diastase is as a treatment for those who have acid reflux issues. Acid reflux is caused by certain foods we eat that are not being digested properly—it causes symptoms of upset stomach, burning in the throat or chest, and abdominal pain. Honey and milk contain diastase naturally, and a warm mixture of the two has been said to help treat minor acid reflux symptoms. Regular intake of diastase supplements may also be able to correct an ongoing problem if medication is not an option.

It is generally recommended that individuals follow use instructions when taking diastase supplements. While this enzyme is claimed to help in the breakdown and digestion or starches, it may not be enough to correct some medical issues. Those who continue to experience problems with digestion or diabetic symptoms may wish to see a doctor for further assistance.