How do you analyze nutritional values in food recipes?

I know there are computer programs, such as Food Processors, that calculate caloric intake, but do they use the same standard of nutritional values? DO food manufacturers use the same standard for providing nutritional labels? Are there regulations that prevent food manufacturers from misrepresenting/omitting critical info in the nutritional facts? Do Canada Food Inspection Agency/FDA analyze the nutritional facts provided by food manufacturers?How do you analyze nutritional values in food recipes?
They are fairly accurate for macronutrients. They won't necessarily list all the micronutrients, however. If it says 0g fat, you should read the label because they are allowed to round down fat grams and there could still be oil.





Ballpark figures should be sufficient for calorie tracking however, you really should be eating within a range of calories each day not a specific number, since even the calories in say, an apple are determined by taking the average of many apples and your apple might have a few more or a few less calories than that average.