I didn't even remember it was that old (researched it a lot before I started, but mainly focused on studies about the effects and issues, not history, plus, well, 10 years ago). Must have been hard on the early days without easily available nut flours and tons of recipes online.

she likes doing difficult things. she's pretty amazing actually

it turns out it's more than a century old; see https://en.wikipedia.org/wiki/Ketogenic_diet#Diet