The complaining wasn't confined to Twitter. People were writing and calling the company regularly to complain about the changes.
Strangely enough, gripes about the missing artificial coloring and flavoring in Trix were so plentiful that General Mills announced it's bringing back the classic colors.
Trix will now be offered in two variations. The current version will remain on shelves as Trix. It will continue to have no artificial flavors or colors from artificial sources. It will be joined by Classic Trix, a cereal loaded with all the artificial colors people couldn't stand to live without.