Recently I spent a day in the ER. I had a Zoom book club meeting the day before and was eating a tuna fish sandwich as I sat at my computer chatting with my book club friends. I made the tuna salad myself and in fact my husband was eating it downstairs while I was upstairs Zooming, and he later told me he thought it tasted fine. But it tasted off to me, and a few hours later I felt sick to my stomach and that night spent more hours in the bathroom than in bed. The next morning I still...