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Answers
beans contain a wide range of nutrients. They contain some ‘antinutrients’ and also contain other components, e.g., isoflavones, which may have beneficial effects on health.
Nutrients
Soya beans contain protein, fat, carbohydrate, vitamins, minerals, and fiber.
Protein
Soya beans are a good source of protein, containing 14 g per 100 g. This is more than that in most other vegetables and more than that in most other legumes (typically 5–9 g per 100 g), the exception being peanuts, which contain 26 g of protein per 100 g. In terms of protein quality, soya contains substantial amounts of most essential amino acids. When compared with a reference protein (egg), soya protein, in common with other legumes, is deficient in sulfur-containing amino acids (the essential amino acid methionine and the nonessential amino acid cystine) and has a higher content of lysine. Combining legumes with cereals provides a meal with a high protein quality, as cereals have adequate amounts of sulfur-containing amino acids but are deficient in lysine. (See PROTEIN | Food Sources.)