a 1200 calories diet

blkericia

Hello friends! I want to know if I do a 1200 calorie diet will I lose my muscle mass?
I was wants 385lbs and I lost 210lbs unfortunately I gained back 40.
My question is will I lose my muscle mass if I try to lose these 40 fast.?
I know slow weight loss is better but I also know how nice it would be if I did lose it fast.
any tips will be great.
my weight is 210lbs goal 155
calories eating 1600 net