pretty simple, when you look at the back of a bag of any sort of food they have the ingredient info. how many calories, sugars, things like that; how do they know how much is in them?
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In the past they would put their food in a measuring device, set it on fire, and figure out how hot it made everything.
Nowadays it’s more boring, they look up the calories of everything they put in and add them up.
It’s their recipe. They know what they’re putting into the food and how much. The ingredients have known nutritional values.
It’s not like they’re just randomly throwing stuff in and hoping for the best.
Simple. Recipe is known, including ratios of all the ingredients. The calorie content of all the ingredients are also known now. So it’s just simple tally of how much calories/item x # of items/serving or bag
To be very clear here, they are NOT testing the individual package. They put together a manufacturing run of a product, test a few of the final results, and use that to determine the nutritional facts of the product.
Also an interesting note, the expiration date for products is determined the same way. There is no test done on the individual item you bought in the store. They determined that this product will expire in 6 months, so it gets an expiration date printed on it for 6 months after the day it was packaged/bottled.
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