A diet which is a subset of another diet can still be classified as a diet of that type, at least that’s how I think of it.

> Just not starchy or sweet ones, e.g. cauliflower, lettuce, broccoli, etc.

I dropped broccoli because of high carbs..

Doesn't literally any diet that induces ketogenesis qualify as "a keto diet"? Or, has somebody branded some particular ketogenesis-inducing diet "THE keto diet"?

I'm vaguely aware of some non-epileptics trying to induce ketogenesis in order to lose weight (which seems pretty dangerous, and maybe self-defeating since smelling like turpentine is less attractive than having curves), but real ketogenic diets (as recommended by medical professionals for intractable epilepsy) generally contain plants.

I'm not sure I understand your comment, but a ketogenic diet is sustainable indefinitely although it becomes challenging. The majority of calories are taken as fats, rather than carbohydrates/starches/simple sugars as is the typical western diet. The liver quickly adapts to burning fats rather than converting sugars and avoids the associated insulin conversion response.

Nevertheless, after being inundated with the food groups adn "healthy" food pyramid favoring carborhydrates ('healthy grains'), it does feel very odd to put four tablespoons of butter in cup of coffee, then follow that with a breakfast of 1/2 pound of bacon with eggs and cheese, and convince oneself you're eating a healthy diet. My results speak for themselves though -- lower serum cholesterol, weight loss, and lower blood pressure.