I just eat about 1 - 10grams of carb per day, pretty much an all protein diet.
Following a keto diet I am never hungry or ever craving, I dont count calories but since I eat only like once or twice and its pretty much all protein it ends up being pretty low calorie as well.
I've done 1200 calorie diets in the past with great success and I had plan to do that before I heard about keto, it definitely works but it never solved the craving issue and I never knew how good I can feel till my body got into the state of ketosis.
I also work out extremly hard,
1hr on the elliptical
32 steps of stairs x20 (outdoor public park)
1hr of basketball (mainly just running and shooting)
30 mins elliptical
10 mins Boxing sparring, (Punching while moving, great for foot work)
I do this for 5 days a week.
Keto does make you feel a little weaker than when you have stored glycogen in your muscle, so I break up my exercises and rest a bit before the next one.