Now you’ve got me curious. What kind of items? I can think of grapefruit sorbet, and grapefruit soda pop, maybe jelly beans, hard candies? What else might it be found in, that we wouldn’t expect? (Not asking you to take the time to write a treatise or anything, just curious if you wouldn’t mind naming a few things you know of offhand?)
Hmm…candied mixed peel for baking, I can think of. I suppose it could show up in chutneys or pickle (I love the jars of stuff that are labeled “may contain”-- in other words, they’ll use whatever’s plentiful and cheap at the time). Various bottled sauces?
Lots of juice blends and fruit flavourings, especially naturally “sour” or “tart” flavours. We were surprised how many. It’s also quite common in fine dining reductions as well (again, thought there was zero chance of this until we mentioned it offhand to our serving staff, who then reported otherwise to us).
In reality, I’m sure the quantity matters (because otherwise I wager you’d hear about these interactions far more), but the same drug has poor interactions with tannins found in red wine and tea that make the affected family member nearly instantly nauseated if they consume tea/red wine on a empty stomach, which is why we take care.
Of course, this is a small edge case - I’m sure most fruit juice is far from dangerous to consume, calorie considerations notwithstanding.
By way of contrast, the folks over at TreeHugger.com can’t seem to get enough of “wonderful” ways to turn otherwise good food into juice. I get it–I understand–they’re just to darn lazy to chew their food.