I learned some scary stuff about sugar recently (see e.g. Lustig's Sugar: The Bitter Truth and this Mother Jones piece). I got the same feeling as when I read about the history of de Beers: like something that felt like just a background fact about reality (sugar is okay for you, diamonds are how you show someone you love them) was actually carefully constructed by a corporation to make money. Seems like I should trust everything else that feels like a background fact about reality slightly less in response.
I'm wondering about the Mother Jones piece. The increase in sugar consumption is 10%-- from 120 pounds/year to 132 pounds/year. I grant that not everything in biology (or the rest of science) is linear, but does it seem likely that there are such huge effects from a relatively small change in sugar consumption, or might something else be going on?
Still, increasing your doubt about background facts seems reasonable.
This is the public group instrumental rationality diary for April 5-14.
Thanks to cata for starting the Group Rationality Diary posts, and to commenters for participating!
Rationality Diaries archive
Next post: 4/15-29