My allergist wrote me this today…

Reactions to dye's are very rare. We do not have testing for many dyes. Have you had reactions to red dyes in the past? I would avoid purple gatorade. We could potentially test for one type of red dye during your follow up visit however this dye is Red #4 and not the Red #40 which is in Gatorade. Another possibility is that you are not reactions to any food or medications specifically but this represents a more internal process. We could discuss more at the follow up but for now would just avoid whateverr you consumed before the symptoms which in this case would be the purple gatorade.