Keto haters - what to say to them?

[Artemis]

Being a history buff, I researched low carb diets and use in history.
In 1797, John Rollo reported on the results of treating two diabetic Army officers with a low-carbohydrate diet and medications. A very low-carbohydrate, ketogenic diet was the standard treatment for diabetes throughout the nineteenth century.
Lay that on those that call it a fad!