I just started reading the book but I don't think it is covered. I know that coffee is OK so other than these being artificial I don't know why they wouldn't be allowed but my gf says its a hard no. Here are the ingredients. Please only respond if you have a definite reason because I know caffeine is allowed and I don't see any sugar listed on the package.
Potatassium Nitrate, Benzoate, Sorbate