I've been going over some of my favorite recipes to make sure I didn't goof on the carb counts & serving sizes. In double checking various products I'm getting totally frustrated - the total carb counts can vary wildly!

4-oz canned mushrooms, for instance, run from 3- 6g total carbs. Hemp hearts go from 1g to 4g for a 3-tablespoon serving.

Who does one believe? And why are different companies allowed to come up with such different counts?

Thank you for letting me vent!