If you read Japanese you can read about the Shangri-La Diet here:
https://www.suda.tv/archives/2007/03/post_580.php
https://ameblo.jp/pb-038434/entry-10044923240.html
https://groundhogday.seesaa.net/article/7497773.html
And even if you don’t read Japanese you can appreciate the excellent illustration here:
https://dietxdiet.ojaru.jp/Shangri-la/
and the great blog name (my nonsequitur) and banner here:
https://www.owl-tottori.jp/diet/jijou-bn/shangriradiet.html
Thanks to Pearl Alexander.