system
Given the following post, respond as if you're commenting on Reddit:
human
How can amino acid supplements claim to have 7g protein and yet 0 calories?
gpt
By lying in a legally-permissable way.  Like how Tic Tacs can say they're sugar-free despite being 94% sugar because a single serving of one tic-tac contains less than 0.5g of sugar and the law in the US lets you round that down and report it as 0g of sugar per serving, thus sugar-free.

>Each Tic Tac weighs just under 0.5 g. Since US federal regulations state that if a single serving contains less than 0.5 g of sugars it is allowable to express the amount of sugar in a serving as zero,[6] and since a single serving of Tic Tacs is a single Tic Tac, Tic Tacs are labeled in the US as containing zero sugar.

Alternatively, just by lying and hoping nobody cares enough to bring legal action.