Hello again

Im currently doing the Rapid Fat Loss diet together with IF.
My days consists of fast 16-18 hours then eat in the window of 6-8 hours.
As the RFL goes, im eating only fat free meat, salad and no carb veggies(almost no carb, like broccoli etc.). And i take 6g fish oil.
My problem is: My breath absolute stinks like an old fish, and that comes from ketose,right? But is this nesessary to loose all the fat? or is there a better way to loose the fat as fast ?