Experts have issued a warning to anyone who buys sourdough bread: not all loaves on supermarket shelves are the real deal. There is one simple label check that instantly identifies whether a loaf is genuine or fake.
What Makes Real Sourdough?
Real sourdough contains very simple ingredients: flour, water, and salt. Over recent years, sourdough bread has become a kitchen essential across the UK, with many people turning away from heavily processed loaves in favour of this healthier option. Sourdough is also praised for its gut health benefits, thanks to its active ingredients and lengthy fermentation process.
The Yeast Test
Dr Vanessa Kimbell from the Sourdough School Magazine explains that there is a straightforward way to determine whether your sourdough loaf is authentic. She points out that yeast, the ingredient that makes ordinary bread rise, is not needed in genuine sourdough. "If you see yeast in the ingredients list, it is not genuine sourdough. The wild yeast in a live starter does the work - adding commercial yeast is a shortcut that bypasses the fermentation process entirely," she said.
Traditional "yeast bread" relies on packets of commercial baker's yeast to make the dough rise rapidly. In contrast, genuine sourdough uses a natural starter, which requires a longer fermentation period but produces a far more distinctive flavour and texture. This natural starter contains naturally occurring wild yeast that develops as the ingredients ferment, making it different from the type you purchase in sachets for baking other kinds of bread.
Other Red Flags
Another red flag to watch for is the words 'sourdough flavouring' or 'sourdough concentrate' on the ingredients list. Vanessa said: "These are additives designed to mimic the taste of fermentation without any of the process or the benefit."
Nutritional Differences
It is not just the flavour and texture that vary between genuine and fake sourdoughs. Vanessa explains that the nutritional value can also be affected. "During the long fermentation process, something remarkable happens to the nutrients in flour. Grains contain phytic acid, which binds to minerals like iron, zinc, and magnesium and prevents our bodies from absorbing them. The organic acids produced by lactic acid bacteria break down this phytic acid, releasing those minerals so they become bioavailable - meaning our bodies can actually use them," she said.
Research has shown that sourdough fermentation is more efficient than yeast fermentation in reducing phytate content. Vanessa added: "In real sourdough, almost all the vitamins and minerals in the flour become significantly more accessible. Fast-risen bread simply doesn't have time for this transformation to occur."
