I always trust the package over any other online resources. I figure the manufacturer knows what they put into the product, so they are the best source for nutritional info. I only use the online resources for things like fruits and veggies that don't come with nutritional info. I also have a really long list of custom foods, and it is getting longer all the time.
I do wonder sometimes, though. I could swear that Trader Joe's changed the calories on their fat-free English muffins from 130 to 110 per muffin. I'm pretty sure I'm right on this, because I have a custom food entry set up for the muffins at 130 calories (and I would have been looking at the package when I set it up) but now the label says 110 calories. I suppose it is only 20 calories and at least they went in the right direction, so I should stop obsessing about it. But I keep thinking that if they could be wrong about the English muffins, what else might they be wrong about?
They have a couple of salads where the calories seem to good to be true.
I do refigure the nutritional info for any recipes I make, though, even if nutritional is provided with the recipe.
I finally gave in and bought a food scale so that my calorie/food obsession could be fully realized.
It was $5 and worth every penny. Right now I'm not eating a lot of pasta, but when I do, you can be sure I'll weigh it! It sure beats counting out each strand of spaghetti, which is what I did before I had the food scale.