I actually used to do the exact same thing in High School and College, when I played football, I was a lineman and would eat like crap 10 months out of the year, then have to drop about 50 - 60 lbs before the season...I ate like a tank, 6 eggs for breakfast with 2 hamburger patties, cheese, your basic high protein diet, I kept my carbs under 20 grams a day, and it kept me in ketosis enough that I would drop roughly 1 - 2 lbs a day, this is not something I would recommend on going, I was able to actually gain in strength and had great energy while I did it, but I would experiment, try going to 15 grams a day if you really are at 0 carbs a day now, when you start to work out, BIGGEST thing about ketosis, DRINK DRINK DRINK WATER!!! it is hard on your kidneys, you have to constantly keep your body flushed out. Good luck to you.