Most patients predicted that their worst symptoms when exposed to gluten would be classic lower digestive problems like diarrhea, bloating and cramps. However, none of these occurred during the acute immune responses observed by Anderson’s team. Instead, patients experienced nausea and vomiting. Anderson describes them as, “acute food poisoning symptoms that are early in onset,” and relatively severe.

“For all the years that we’ve known about celiac disease, persons have told us that they had these acute reactions, but many experts in the field dismissed them as being just in the person’s mind,” says Anderson. “Here we are now, a hundred years after celiac disease was discovered, suddenly discovering, yes, the patients were right.”

Nausea and Vomiting Mark Gluten Exposure in Celiac Disease 🙄

(Emphasis mine)