04/22/2026
The old type of microwaveable, popcorn, problem that produced what is the low functioning mitochondria dysfunction
The chemical you are referring to is diacetyl (2,3-butanedione), a flavoring agent used to give microwave popcorn its buttery taste. It was largely phased out by major manufacturers after it was linked to a severe, irreversible lung disease known as bronchiolitis obliterans, or "popcorn lung" (Brass et al., 2017; Lockey et al., 2009).
Beyond the lung damage, recent research has explored how diacetyl disrupts cellular metabolism, specifically leading to acquired mitochondrial dysfunction.
The Danger: Diacetyl and "Popcorn Lung"
Diacetyl is highly volatile, meaning it easily turns into a gas when heated. When inhaled, it causes significant damage to the airway epithelium (Brass et al., 2017).
Bronchiolitis Obliterans: This condition is characterized by airway-centered fibrosis that can lead to total airway occlusion and death (Brass et al., 2017).
Occupational Risk: The danger was first identified in factory workers who were exposed to high concentrations of diacetyl v***r in mixing areas (Lockey et al., 2009).
Removal: Due to these risks, major popcorn brands removed diacetyl in the late 2000s, though it can still be found in some electronic cigarette "e-juices" (Cahyaningrum et al., 2023).
Mechanisms of Mitochondrial Dysfunction
Acquired mitochondrial dysfunction occurs when external toxins like diacetyl impair the cell’s ability to produce energy. Diacetyl affects the Mitochondrial Electron Transport Chain (ETC) through several pathways:
1. Disruption of the Electron Transport Chain (ETC)
Exposure to diacetyl-related compounds can lead to a compromised ETC, which increases the accumulation of NADH and shifts the cell toward glycolytic ATP production (Donnelly et al., 2011). This metabolic shift is a hallmark of mitochondrial myopathy and cellular stress (Donnelly et al., 2011).
2. Metabolic Shifts in the TCA Cycle
In vivo studies show that diacetyl exposure alters metabolites within the Tricarboxylic Acid (TCA) cycle and the urea cycle (Jedlicka et al., 2018). These disruptions prevent the mitochondria from efficiently processing nutrients into energy.
3. Oxidative Stress and Protein Modification
Diacetyl is highly reactive and can modify proteins involved in cellular signaling (Brass et al., 2017). This leads to:
Increased LDH Activity: An indicator of cellular injury and membrane damage (Brass et al., 2017).
Reactive Oxygen Species (ROS): Elevated oxidative stress that further damages mitochondrial DNA and the lipid membrane (Jedlicka et al., 2018).
Additional Concerns: PFAS in Packaging
While diacetyl was the chemical removed from the flavoring, the packaging of microwave popcorn often contained PFAS (per- and polyfluoroalkyl substances). These "forever chemicals" are used for grease-proofing but are also linked to endocrine disruption and liver damage (EWG, 2024).
References
Brass, D. M., Gwinn, W. M., Valente, A. M., Kelly, F. L., Brinkley, C. D., Nagler, A. E., Moseley, M. A., Morgan, D. L., Palmer, S. M., & Foster, M. W. (2017). The Diacetyl-Exposed Human Airway Epithelial Secretome: New Insights into Flavoring-Induced Airways Disease. American Journal of Respiratory Cell and Molecular Biology, 56(6), 784–795. https://doi.org/10.1165/rcmb.2016-0372oc Cited by: 27
Cahyaningrum, C. P. E., Andari, D., & Djunaedi, D. (2023). Anatomical Pathology Differences in Lung Alveoli Damage with Exposure to Conventional and Electric Ci******es. Jurnal Respirologi Indonesia, 43(2), 151–157. https://doi.org/10.36497/jri.v43i2.191
Donnelly, P. S., Liddell, J. R., Lim, S., Paterson, B. M., Cater, M. A., Savva, M. S., Mot, A. I., James, J. L., Trounce, I. A., White, A. R., & Crouch, P. J. (2011). An impaired mitochondrial electron transport chain increases retention of the hypoxia imaging agent diacetylbis(4-methylthiosemicarbazonato)copper II. Proceedings of the National Academy of Sciences, 109(1), 47–52. https://doi.org/10.1073/pnas.1116227108 Cited by: 133
Jedlicka, L. D. L., Silva, J. d. C., Balbino, A. M., Neto, G. B., Furtado, D. Z. S., Silva, H. D. T. d., Cavalcanti, F. d. B. C., Heijden, K. M. v. d., Penatti, C. A. A., Bechara, E. J. H., & Assunção, N. A. (2018). Effects of Diacetyl Flavoring Exposure in Mice Metabolism. BioMed Research International, 2018, 1–11. https://doi.org/10.1155/2018/9875319 Cited by: 12
Lockey, J. E., Hilbert, T. J., Levin, L. P., Ryan, P. H., White, K. L., Borton, E. K., Rice, C. H., McKay, R. T., & LeMasters, G. K. (2009). Airway obstruction related to diacetyl exposure at microwave popcorn production facilities. European Respiratory Journal, 34(1), 63–71. https://doi.org/10.1183/09031936.00050808 Cited by: 66
Shibamoto, T. (2014). Diacetyl: Occurrence, Analysis, and Toxicity. Journal of Agricultural and Food Chemistry, 62(18), 4048–4053. https://doi.org/10.1021/jf500615u Cited by: 111
Diacetyl possesses a butter-like flavor and has been widely used as a flavoring agent. It forms from sugars and lipids via various bacteria and heat treatment in various foods and beverages, such as milk. The toxicity of diacetyl, especially when inhaled, has recently attracted the attention not onl...