The way you make wholemeal wheat bread affects how big it gets. Using sourdough or baker's yeast changes how much mixing, water, and proofing time you need. Sourdough with yeast gives the biggest bread, followed by just yeast. Sourdough needs less mixing and water, while yeast needs more mixing and proofing time. So, sourdough doesn't always make bigger bread than yeast. It's important to get the bread recipe and process just right for the best results.