I have had the downloaded version of fitday for a couple years.
Today I found out there is a way to not only log food, but WHERE you ate it, who you ate it with and WHY you ate it (hunger, emotion, time, party, which emotion, sweet craving, salt craving etc.)
I wouldnt want to do it all the time, but given struggles with emotional eating and gatherings, it might be a useful thing to log a few specific scenarios. (i.e. log emotional eating, or log strong cravings)
Then there are charts available to to see over time what impact it has/causes, success of strategies to overcome, etc.