There are a few possible reasons to explain why you have a tingling tongue after eating. If tongue tingling happens during a meal or shortly after eating, it could simply be a food allergy. You can determine this by writing down the types of food that are often associated with tingling. A deficiency in vitamin B12, infection, and Raynaud's syndrome are also known to cause numbness and tingling. A healthcare provider can help you figure out what is causing the issue.