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Diacetyl

Diacetyl is a chemical that imparts a butter flavor to food and beverages. Diacetyl is used in a variety of food products, from butter flavored microwave popcorn to baked goods, candy, and cake mixes. Diacetyl is rarely mentioned on an ingredient label, but is often included under ‘artificial flavoring’. Exposure to diacetyl has been linked to a debilitating lung condition known as bronchitis obliterans.

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OSHA: Flavorings Related Lung Disease

NIOSH: Diacetyl

Project on Scientific Knowledge and Public Policy on Diacetyl