How is the accuracy of nutrition labels enforced?

Im curious what prevents companies from skewing these results? As an example, if I was GM determining lucky charms' sugar content, why would I use a realistic amount of marshmallows as the consumer would be eating. Why should we be trustworthy of these corporations given their dishonest and manipulative track record?

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Sometimes it can be other companies calling them out, they can report it to the FDA. So I assume companies are constantly testing their competitors’ products to see if they’ve slipped up. They kind of keep each other in check. This could be a really easy way to knock a competitor’s product off store shelves and it would get ridiculously expensive to do a recall. No serious company is going to take that kind of chance by outright lying.
Consumers themselves can also notify the FDA if they suspect something is off.
I assume after they receive a pattern of complaints, the FDA will perform their own analyses, and/or they may be constantly doing random inspections across the food industry.
Usually, depending on the severity of the issue, the FDA starts off with a simple warning letter to a company with false claims, however these warning letters are treated extremely seriously. Food manufacturers do NOT want to get on the bad side of the FDA. I assume they keep a closer eye on manufacturers with recurring issues.

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Source: Work with nutrition labeling & smarter people than me who deal with FDA food regulations

Also: https://www.fda.gov/consumers/consumer-updates/fda-foods-must-contain-what-label-says

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I want to know why some nutritional labels omit nutrition by serving:

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i.e. let’s say hypothetically a brownie serving is 67g

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but the nutritional label completely omits the nutritional information for a serving (67g) and instead only lists it for 100g, the end result being I have to manually calculate anything that isn’t 100g.

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Regulatory agencies are not checking every product that comes to market. There are too many. They will, however, check out a product if they are made aware of the incorrect description, and that the source of the claim has credible evidence.

There may be some watchdog groups out there that do independent product testing, but there are so many products, it’s not realistic to get them all.

Also, companies have some leeway when reporting numbers. Laws/politics play a huge role in this.

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What about the’ South Hampton 6’ food colouring that is banned in Europe? If it’s sugar your worried about there’s really no sense in reading the labels. The FDA needs to ban these colour chemicals.

Labels are horseshit. Eat whole foods. A banana is 100% banana

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I have always wondered this. They are allowed a margin of error, and they take full advantage of that. I forget the allowable give or take, i think it is around +-10%. So if they say it has 30g of sugar per serving, it may actually have 33g, and they know that.