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.
The most common preservatives, such as sorbic acid, benzoic acid, calcium propionate, sodium nitrite and disodium EDTA, are used to kill bacteria and fungus that cause rot. Other preservatives, such as BHT, BHA and propyl gallate, prevent food from changing color when exposed to oxygen.