A small study has linked the bugs residing in one's gut with a desire, or lack of desire, for chocolate.

Still to be determined is if the bacteria cause the craving, or if early in life people's diets changed the bacteria, which then reinforced food choices.

If I can blame gut bugs for my yen for warm, crusty bread, I'll have it made.

In other news, this is the type of article I was thinking of when I asked about research like the lactose study cited in this post. It was all an offshoot of some things I pondered as I wrote the Jani books, that living on a new world, even a terraformed world, would start to alter you on a genetic/gut bug level and that gradually, over a very long period of time, those changes would alter you. Yes, it was a handwavy justification for hybridization, albeit at a glacial pace, and with a bucketload of assumptions.