I know one thing I cannot eat very much steak, because it is so filling.
I don’t sit their and weigh it but I do cut tiny pieces and enjoy the taste.
Can’t shake my booty on the dance floor if my tummy feels like it’s going to burst…lol
Besides water weight it could be the amount of let’s say steak eaten because the steak will release glycogen from storage in muscle tissue (if muscle tissue is not filled with too many fatty deposits which can inhibit the process to certain degrees?) and allow the body to burn adipose tissue?
You over-eat the steak while in ketosis and you get gluconeogenesis and you then trip hammer insulin rather than glucagon, glycogen storage gets filled back up in the muscle tissue and adipose tissue does not release lipid droplets for fuel to be oxidized but instead insulin stores the extra sugar back into the fat cell as lipid droplets (then you get fat all over again?).
So there is some truth to burning body fat by eating just steak! 
To clarify what over-eating steak would be while in ketosis; that would be over 3 or 4 ounces, I can barely eat 2 ounces…lol
Would eat a couple of eggs with that steak to potentiate visceral fat burning?