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>"It could be 99% filler and not be a lie."

There is no evidence that McDonalds has included any filler in their burgers at all (at least in recent history). See the link in the cousin-comment for more information on what has been claimed and what has been proven (so far): https://news.ycombinator.com/item?id=49247943

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> the beef portion of the hamburger patty is "100% PURE ALL-AMERICAN BEEF"

But the claim isn't about "the beef portion". If what you say is true it would give a competitor the chance to say "McD's burgers are 100% unhealthy fat" because the unhealthy fat portion is 100% unhealthy fat.

> It could be 99% filler and not be a lie.

I doubt it. Not sure about the US but in Europe there are laws that tell you how much or how little of something you can have before you advertise that thing. For example you can't say "now with less sugar" if you reduced the quantity of sugar by 0.001g. And you can't call it "olive oil" if it has 2% olive oil.

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> And you can't call it "olive oil" if it has 2% olive oil.

Which is still way too lax. It should only be called olive oil when it's 100% olive oil. You can pick some other name like "olive oil based" or "unholy mixture of the cheapest gutter oils we could find" which clearly indicates that what you are selling is in fact a combination of oils.

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I forgot to mention, my bad, I used some random numbers. The EU "nutrition claims" numbers are here [1]. If you want to claim "less salt" then it must contain at least 25% less. For most other ingredients it's 30%, so you can't advertise "less X" forever because you reduce 1 nanogram at at time.

For olive oil you can find the details here [2]. As above, there's no such thing as "the olive oil part was olive oil". The label is for the product.

The US probably has something similar, even if watered down.

[1] https://food.ec.europa.eu/food-safety/labelling-and-nutritio...

[2] https://agriculture.ec.europa.eu/farming/crops/olive-oil_en

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