You have to consume 3500 calories above your daily metabolic rate (what you expend) I don't know about men but the average adult woman expends between 1500-1700 a day add exercise maybe 2000 -2300 so if post sleeve she would technically lose 1/2 a pound a day but then other things come into play water retention/loss, starvation mode, the need to dump the toxins that build up during rapid weight loss. In other words it is complicated those 3500 calories do equal a pound of fat but it works cleaner on gaining it then losing it.