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I've heard a thousand times that legumes themselves are "incomplete proteins", meaning they are deficient in some amino acid, so it is beneficial to combine them with grains, which have the amino acid that legumes lack.

In all the websites I've read, the lacking amino acid in legumes is methionine, which grains have supposedly a lot.

However, when trying to estimate how much of this amino acid I need to consume daily, I found something really confusing, legumes actually have more of all amino acids than grains (yes, including methionine).

Yet, everybody is claiming that they need to be combined, and this isn't like a debate, everybody seems to agree.

So why is it that mixing these two foods make "complete proteins"?

I would also appreciate if you would link a source, although is not necessary

Thanks!

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  • Could you provide us with a link to one of the websites as an example? This would be a great edit to your answer.
    – Narusan
    May 3, 2017 at 6:24
  • Some example of methionine content in foods: lentils, chickpeas, white rice, brown rice. To read the methionine content scroll down to "proteins" and hit the "more details" button.
    – Sam
    May 3, 2017 at 15:56

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