I found something interesting on Wikipedia. Miraculin - a fruit that changes your taste buds so that for a while, everything acidic tastes sweet.
https://en.m.wikipedia.org/wiki/Miraculin
I had to laugh when I read the part about how this fruit was prevented from coming to market. Such skullduggery! Wow, it's criminal that somehow they got away with it. I should be outraged, but unfortunately I'm not much of a cook so I don't care. Maybe somebody else will get mad about this:
[Copied from the Wikipedia page about this fruit.]
"Miraculin was never approved for use as a sweetener by the United States Food and Drug Administration (FDA). In the 1970s the Miralin Company planned on bringing miraculin to market and was founded with investments by Reynolds Metals, Barclays, and Prudential. Legal advice and contact with the FDA indicated that miraculin would be approved as generally recognized as safe (GRAS) as the berries had been eaten for centuries in Africa with no reports of adverse reactions (substances used in food prior to January 1, 1958, through either scientific procedures or through experience based on common use in food can be designated GRAS). However, on the eve of the product's launch in 1974 the FDA determined that miraculin would be considered a food additive and thus require years of further testing. At that point the company's investment capital could not sustain it and Miralin folded. Afterward, Miralin requested the FDA documents under the freedom of information act. The documents were nearly completely blacked out, and the rationale for the sudden change in regulation was not revealed.[17][18][19]"
