Bookmark this What Causes Food Allergies? For some people, a simple peanut or a bite of shrimp can cause the body’s immune system to wildly overreact. In some cases, the results can be deadly. But what exactly is happening in the body for it to confuse nuts or shellfish with a true threat? @seeker Jun 11, 2019 Like Like 0 Comments No comments yet. Create an account and log in to post a comment.