Who has been able to lose with 1200 calorie diet?

i have been consistently losing 1kg per week at 1200 net calories for 6 weeks now (from 84kg to 78kg).

during this time i have improved my fitness (ran 15km yesterday, doing 30 pullups daily and 300 pushups every other day) and seing great results in my physique.

1200 works very well for me.

P.S.: This is as a 6ft male.