I've been following a ketogenic diet 90% of the time since 1999 or so and paleo since about 2003. Paleo actually spans the range from high carb to zero carb, but naturally trends more often in the LCHF areas. It's more about the source of your macronutrients than the level of those macronutrients. You can be keto on mtc, baloney, and McDonald's burgers without the bun or you can do it with grass fed beef, organic vegetables, and coconut oil.