When I started baking bread, I used whatever flour was cheapest at the supermarket. My loaves were dense, flat, and frustrating. When I switched to bread flour with higher protein content, everything changed. Understanding flour — specifically protein content — is the single biggest thing that separates amateur bread bakers from people who consistently produce bakery-quality loaves at home.
Protein Content: The Number That Matters
Flour protein content is the primary determinant of gluten development. Protein content is listed on flour bags and varies dramatically: cake flour (6-8% protein), pastry flour (7-9%), all-purpose (10-12%), bread flour (12-14%). This percentage is the weight of protein per 100g of flour — not the percentage of the flour that is protein by calorie.
When flour meets water, the proteins glutenin and gliadin combine to form gluten. More protein means more gluten can form, which means a stronger, more elastic dough that holds gas better and produces a more open crumb. For sandwich bread, you want moderate protein (11-12%) for a tender but structured crumb. For artisan breads with an open crumb, you want high protein (13-14%).
The Difference Between Flour Types
All-purpose flour is a blend of hard and soft wheat, designed to be versatile. For bread, it's often slightly too weak, producing a crumb that's tight and lacking in structure. For cakes, it's slightly too strong, producing a tough rather than tender result. The compromise is adequate for both but optimal for neither.
Bread flour is milled from hard wheat varieties with consistently high protein content. The protein in bread flour is also higher quality for gluten formation — more of the specific glutenin molecules that create strong, elastic gluten networks. If you're serious about bread baking, bread flour is the minimum starting point.
Whole Wheat and Whole Grain Flours
Whole wheat flour contains the entire grain — bran, germ, and endosperm. The bran and germ contain oils that go rancid over time, which is why whole wheat flour has a shorter shelf life than white flour. More importantly for baking: the bran particles cut through gluten strands, physically interrupting the gluten network and reducing dough strength.
You can still produce excellent whole wheat bread, but you need to adjust your technique: use a slightly higher hydration (the bran absorbs water), knead less (to avoid cutting the gluten with overwork), and consider using a mix of whole wheat and bread flour (20-50% whole wheat) until you understand how the bran affects your dough.
Storing Flour
White flour keeps for 6-12 months in a cool, dry pantry. Whole wheat flour should be used within 3-6 months, or stored in the freezer to extend shelf life. Never refrigerate white flour — the humidity causes it to absorb odors and moisture. Flour absorbs odors from its surroundings, so store it away from onions, garlic, or strongly scented items.