In addition to intermittent fasting with ease (14 hrs is long enough for women) I'd say being able to go with eating minimal carbs < 50 g for 18-24 hours is a very reliable indicator, plus not needing to snack. Also losing body fat indicates you are a bit of a fat-burning beast (sorry if that's stating the obvious).
For me it took a month or two of eating primally before I no longer experienced strong hunger, and it was a few months before I was able to eliminate snacking and do intermittent fasting.
As you're getting positive results so far, I say stick with it and that you will be amazed at the gradual improvements in your health all round.
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.