They used the Dietary Inflammatory Index, which generally looks for nutrition density for the calories:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8483957/
So a high fat diet (Keto) can have a lot of very low carb veggies and can have Omega 3/6 fats that we have to have, but fat for the sake of fat in excess of what can be used is not helpful. However, carbs for the sake of carbs is also not helpful.
However, Keto/low carb greatly reduces appetite, which can reduce total incoming calories, so the overall nutrition from foods is higher, proportionately.
A combo high fat, high carb diet would seem to be the worst, as many nutrients may be missing for the total calories consumed.
Yep, totally with you on that. Just noting that they’re still reluctant to point out the elephant in the Living Room (carbs).