Overview
Flour is a powder obtained by grinding edible seeds, nuts or other plant tissues. Most commonly it refers to wheat flour, but many other sources—such as rye, corn (maize), rice, oats, buckwheat, and various legumes or nuts—are milled into flours for cooking and baking. For a general introduction to the variety of raw materials used, see grain varieties and a brief description of the milling process. Historical and modern recipes rely on flour for structure, texture and absorbency in prepared foods.
Characteristics and main types
Flours differ by source, protein (gluten) content, particle size and treatment. Wheat flours are usually classified by strength (high-gluten, all-purpose, cake/pastry) and by whether they are whole-grain or refined. Other common flours include cornmeal, rice flour and nut flours. For background on wheat specifically, see wheat, and for an overview of everyday culinary categories refer to common flours.
- All-purpose (plain) — versatile refined flour used for many recipes.
- Cake/pastry — lower protein, produces tender crumb.
- Whole-grain — includes bran and germ, higher fiber and flavor.
- Gluten-free flours — made from rice, buckwheat, nuts or legumes.
Production and a brief history
Traditional milling used millstones to crush grain; modern industrial mills typically use steel rollers and sieving to separate endosperm, bran and germ. The basic idea—turning dried seed into a powder for storage and cooking—has existed for millennia. Modern mills, sometimes called a flour mill, combine grinding with cleaning, conditioning and separation steps; mechanical improvements and automation are summarized under mechanical milling. Home kitchens can also produce small batches of flour with grain mills or high-speed blenders.
Uses and culinary importance
Flour is a foundational ingredient for many staple foods. It supplies structure in baked goods through proteins and starches that form networks when mixed and heated. Common applications include:
- Bread and other leavened doughs, where gluten development and fermentation are central.
- Pasta and noodles, often made from durum semolina or high-protein wheat.
- Cookies, cakes and pastries, where tenderizing ingredients and flour type affect texture.
- Flatbreads such as tortillas, chapatis and crepes.
- Thickening sauces and batters for frying.
Leavening is sometimes built into flour blends: self-raising (self-rising) flour contains added baking powder; otherwise recipes rely on separate leavening agents and techniques during baking.
Nutritional aspects, storage and safety
Whole-grain flours retain bran and germ and thus supply more fiber, vitamins and oils than refined flours; refined flour has a longer shelf life but fewer nutrients unless enriched. Some flours contain allergens (notably wheat and tree-nut flours). Proper storage—cool, dry, airtight containers—reduces rancidity and pest infestation. For dietary substitutions and technical details in recipes and food production, consult practical resources on culinary uses and specific ingredient guides.
Notable distinctions and practical tips
When substituting flours, consider protein content, absorptive capacity and flavor. Gluten-forming flours provide elasticity in bread; lower-protein flours produce finer crumbs in cakes. Many recipes require blending different flours to achieve the desired texture. Bakers often test dough feel and hydration rather than relying solely on volume measures.
Further reading and reference links: grain varieties, milling process, wheat, culinary uses, bread, pasta, cookies, cakes, tortillas, flour mill, millstones, steel rollers, mechanical milling, common flours, leavening agents, baking.
