Most nutrition databases have both "cooked" and "uncooked" values. While I'm going to state my anal preference/reasoning below, the main thing is to make sure you're basing your intake on the right one (i.e., "cooked" if you're measuring it after cooking) and being consistent.
As for me, I always weigh my foods raw for reasons of convenience and a slight advantage in consistency (since for stuff like meats there's less variation in the "weight" due to day-to-day differences in water lost while cooking).
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