My personal experience over several decades aligns with what Taubes explains in the first book I cited. If you want the technical details, you could read it.

You can't get fat on a diet that is strongly deficient in carbs, while it's easy to get fat on a diet containing high proportions of fat and carbs.

The Eskimo subsist on meat and blubber alone. Roald Amundsen ran the experiment on himself and confirmed it.