soy flour

Soy flour is a fine powder produced by grinding dried soybeans (Glycine max), legumes native to East Asia that have been cultivated for over 4,000 years. The flour can be either full-fat, containing the natural oils from soybeans, or defatted, with most oils removed during processing. Full-fat soy flour has a creamy, slightly nutty flavor and pale yellow color, while defatted versions are lighter in color and have a more pronounced soy flavor with less richness. Both forms are shelf-stable and contain no gluten, making them suitable for gluten-free applications. The flour's unique composition includes a high concentration of proteins and an array of bioactive compounds including isoflavones.

Soy flour functions as both a nutritional fortifier and baking ingredient in diverse culinary applications. In East Asian cuisines, it is used in traditional preparations and as a protein booster in noodles, pastries, and breakfast items. In Western baking, soy flour is incorporated into bread doughs, muffin batters, and cake mixes to increase protein content and improve moisture retention, typically at 5–15% substitution for wheat flour. Its emulsifying properties make it valuable in commercial food production. The flour also serves as a binder in vegetarian and vegan cooking, and when mixed with water forms a paste suitable for coating or thickening. It pairs well with both sweet and savory applications.