Who put clorox in my food?
Since it happens with your first bites of food, it’s probably coming from your salivary glands. Your immune system attacks pathogenic organisms with bleach-like substances, and those could account for a clorox-like burning after they accumulate in your salivary glands overnight. So I would say you may have a chronic salivary gland infection. It might be interesting to see whether a course of antibiotics changes the situation.
At first I thought this is something completely unknown to me but when someone mentioned cold potatoes, I realized that I do get bitter taste from them at first. Come to think of it, from OJ, also. My take is that in these cases, cold potatoes are oxidized on the outside and then you get accustomed to that taste after a minute or so. I always eat potatoes freshly cooked. I never drink bought OJ because once I tried it (the one not from concentrate) vs. freshly made OJ and the difference was so big that I don’t consider bought OJ worth paying for (or drinking). It never happens for me with any other food, though, so I think this is a separate thing from what OP asked about.
