Diastatic activity measures the starch-converting power of malt, flour or honey, quantifying how effectively their enzymes break starch into fermentable sugars. Brewers select malts with high diastatic power to ensure complete wort conversion, while bakers balance flour enzyme activity to control dough fermentation and crust colour. In honey, minimum diastatic activity is a legal quality criterion proving the honey was not overheated. Standardized assays give the comparable numbers that buyers and regulators rely on. Regular testing of incoming malt and flour lets production teams adjust recipes before enzyme shortfalls affect the final product.