Diacetyl is a chemical compound that is commonly used as a flavoring agent in food products, particularly in butter-flavored items. It has a buttery taste and aroma, making it popular in popcorn, baked goods, and dairy products. Diacetyl is naturally found in some fermented foods and beverages, such as beer and yogurt. While diacetyl is generally recognized as safe for consumption in small amounts, concerns have been raised about its inhalation. Workers in industries that produce or use diacetyl have reported respiratory issues, leading to stricter regulations in workplaces to ensure safety.