Boost Metabolism By Doing The Sardine Challenge Oct 10, 2025 | Blog The sardine fast kickstarts metabolism. Here are the quick and easy rules of how the sardine challenge works. source Sharing is caring! Facebook X Pinterest Submit a Comment Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website Save my name, email, and website in this browser for the next time I comment.