Are we repeating these same debunked arguments again and again?
CICO is not true because of just gut microbiome for one, obese people extract more calories from the same food compared to a normal person.
https://www.livescience.com/41954-gut-microbes-make-you-fat....
https://www.newsweek.com/weight-loss-enemy-within-414483
Also metabolism highly varies between people.