They don't contain one of the 20 essential amino acids. Namely methionine. Nuts, seeds, legumes, and grains contain it though, so you can pair beans with your favorite one of those to have a complete protein.
Tofu is just lacking in methionine, not completely devoid of it, but you should have another source.
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They don't contain one of the 20 essential amino acids. Namely methionine. Nuts, seeds, legumes, and grains contain it though, so you can pair beans with your favorite one of those to have a complete protein.
Tofu is just lacking in methionine, not completely devoid of it, but you should have another source.