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Don't get it?

How is it different to a central body with one database where you lookup if this product has passed all the checks / tells you its lifetime info?

What problem can it help with?

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The main advantage is that at the central body, somebody may take bribes to edit entries after the fact or to tamper the data. With a (proper) blockchain that's (mostly) impossible.

How can they attach an ID to a specific food and ensure that it hasn't been duplicated etc? With crypto, it's easy, but if they're just attaching a label to a box it seems ripe for fraud.

I don't believe it helps with any problem. Apart from higher chance of investment and approval within company for being 'innovative'. They are solving simple problem with complex and unproven technology.

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