well ketosis is a state during which your body uses ketones for energy........YOU KNEW THAT, obviously. ketones can only be generated through beta oxidation of triglycerides into fatty acids which are then further oxidized into ketones, ketones CAN NOT be generated from protein, so it only natural that if your fat intake is not suffieciently high the ketogenic state CAN NOT and WILL NOT be acheaved
overall, will you still loose great deal of fat if you keep carbs to zero, and are in caloric deficit..........MOST DEFINETLY, but deep ketosis will not be acheaved