The US News and World Report is at least consistent…yet again they put whatever low carb diet is popular dead last. This year it is Keto and Whole 30. Previously it has been Paleo, Dukan, Atkins, etc.
From Vegan To ‘Keto’ And Mediterranean: Experts Rank 2018’s Best Diets.
https://www.npr.org/sections/thesalt/2018/01/03/575181390/from-vegan-to-keto-and-mediterranean-experts-rank-2018s-best-diets
Keto: https://health.usnews.com/best-diet/keto-diet
For Mediterranean Diet (#1) they did use the Oldways definition.
Overall Diets: https://health.usnews.com/best-diet/best-diets-overall
ABC News gleefully reports: Keto, Whole30 diets rank last on one best diets of 2018 list
http://abcnews.go.com/amp/Health/keto-whole30-diets-rank-best-diets-2018-list/story?id=51953127