a few questions.

1) Atkins says "count carbs not calories...." yet surely calories MUST count some, right? heck, if I mix my tuna with tons of mayo and have a cup of mousse made with cream everyday, the carb count is low but thats a zillion calories! how closely should I watch my calories?

2) how accurate is label info on foods in general? I know carb counts are arrived at "by difference", but in general how truthful do corporations have to be when figuring amount of calories, fat, carbs, etc. can I trust what the label says?

thanks!