Are you following a web site’s diet or the forums stricter version? The forum’s stricter version, most of the people here follow, introduces one of these as a test food item one week after finishing the cleanse and starting the diet. Test food means you test one thing at a time and don’t change anything for a week and watch for reactions.
If you want to try the stricter diet, email Able900 for information about it.
Here is some reading you might be interested in in case you did not read it already: