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.
Sulfites are substances that used as food additives and preservatives to maintain food color and prolong shelf-life, prevent the growth of micro-organisms, and maintain the potency of certain medications. Sulfites are used keep potatoes white and lettuce green, and are also used in the production of some food packaging materials (e.g. cellophane).