My current recommendation when either yeast extract or autolyzed yeast extract is listed as an ingredient in foods NOT labeled gluten-free is to contact the manufacturer and ask whether spent yeast from beer manufacturing is the source.Hereâs whyâ¦.y current recommendation when either yeast extract or autolyzed yeast extract is listed as an ingredient in foods NOT labeled gluten-free is to contact the manufacturer and ask whether spent yeast from beer manufacturing is the source. Hereâs whyâ¦.
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What It Is. An aspartate aminotransferase (AST) test is often part of an initial screening for liver disease. The liver plays a variety of important roles in the body: It stores fuel from food, makes proteins, and helps remove toxins from the body. The liver also makes bile, a fluid that helps in digestion.