“To be fair, carbs are necessary for people who are active.”
Dr. Noakes, who wrote a book on nutrition for athletes and is one himself actually did measurements on athletes...no difference in performance between the standard carb-loading and no carbs.
His theory has been discredited by current research.
High performance (efforts above 75% of VO2 max) require carbs after no more than 30mins.
If one stays below that level fat is adequate.
Not a lot of people exercise at or above 75% of max, but some of us do.
And there not a lot of things that feel worse than a hard bonk.