You can definitely maintain specific weights with IE, but you might hold onto like, five pounds here and there if you make a change in the amount of food you eat.
Initially I think I gained one or two pounds, then stayed there for a while, then slowly floated down at the same time I started weight training. If I don't eat enough I can't complete workouts and feel weak; if I overeat I feel fat and gross. I still weigh daily and I pay attention to what I eat, but there is no numbers crunching, weighing or measuring going on (except for obvious situations like oatmeal to water ratios).
Lower carb, higher protein keeps my blood sugar and hunger moderate.