I go into custom foods and set up each new food based on the nutritional label for EVERYTHING. From what I can tell, it saves it so you'll have the special food there for next time. It is useful to know how many calories, fat, and protein are in things when you get to a stall and need to "tweak" your fat ratio, calories, etc.
I love my fitday (and I recommend the fitday PC for $20, it rules)
-K
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