"These plants are designed to cause an onset of anaphylaxis." Don crossed his arms. "Our bodies can't tolerate it, so its an allergy."

As to why, other than 'the Gamemakers thought it was funny', he had no idea. Nor was he going to indulge how he figure it out. It was probably easy enough to figure out that he had stupidly eaten some the plant life in order to preserve his stocks.