Alpha-1 Antitrypsin (AAT) is a protein produced by the liver that helps protect the lungs and other organs from damage caused by enzymes, particularly neutrophil elastase. This enzyme can break down tissues, and AAT acts as a shield to prevent excessive tissue destruction, especially in the lungs. A deficiency in AAT can lead to serious health issues, including chronic obstructive pulmonary disease (COPD) and liver disease. Individuals with low levels of AAT may experience respiratory problems and are at a higher risk for developing lung conditions. Regular monitoring and treatment can help manage these risks.