An increased AST level is usually a sign of liver disease. Liver disease is even more likely when the levels of substances checked by other liver blood tests have also increased. An increased AST level may be due to any of the following:
In order to keep itself fresh, the lettuce gives off carbon dioxide, causing a slight odour. This carbon dioxide is not harmful and the odour should disappear quickly once the salad package is opened.
Published: November 9, 2011. Updated: March 21, 2013 at 06:24 AM. Q: What kinds of preservatives are used in the packages of salad greens? There must be something in there that keeps the greens safe and stops them from turning brown for so long. A: Ready-to-eat salad greens are packaged in what is called a modified atmosphere, and that is all the preservative that is needed besides refrigeration.