It's important to mix everything up, especially net calories in/out. Our nervous systems cannot possibly estimate calories out anywhere near as accurately as calories in. This is where being active and exercising and doing the minimum of 5 hours low-level cardio a week comes into play.
Creating a calorie deficit 2-3 days a week on average through targetted activity has enabled me to lose a lot of fat and gain muscle without having to decrease my calorie intake or go hungry. If anything I'm consuming more calories daily than when I started. PB explains how this is possible ... i.e. avoid CW chronic low-calorie dieting.
F 5 ft 3. HW: 196 lbs. Primal SW (May 2011): 182 lbs (42% BF)... W June '12: 160 lbs (29% BF) (UK size 12, US size 8). GW: ~24% BF - have ditched the scales til I fit into a pair of UK size 10 bootcut jeans. Currently aligning towards 'The Perfect Health Diet' having swapped some fat for potatoes.