Is sourdough ultra-processed?

Sourdough made of flour, water, salt and a starter is processed, NOVA group 3, the same as cheese or canned beans. A supermarket loaf called sourdough that adds wheat gluten or an emulsifier is ultra-processed. In 25 US sourdough labels, 10 had a marker, and 9 of those were wheat gluten.

“Sourdough” sounds like the safe pick, and on a bakery shelf it usually is. But the word on the bag isn’t a recipe, and some supermarket loaves sold as sourdough carry the same extras as packaged sandwich bread.

We’d go by the label on a sourdough and ignore the name. If the list is flour, water, salt and starter, that’s the loaf. If it’s long, the whole wheat sandwich loaf next to it may give you more fiber for the same group.

Sourdough is like a handwritten sign in a shop window. Usually it means what it says, but you still check the price tag.

What turned up on the labels

We checked 25 US sourdough ingredient lists in Open Food Facts with this site’s label checker on November 14, 2026.

The plain ones looked like “organic unbleached wheat flour, water, sea salt, organic barley malt”.

Vinegar and yeast don’t tip it

Plenty of supermarket sourdough lists baker’s yeast (13 of the 25 did), and the odd one lists vinegar. Neither makes a loaf ultra-processed, since both are things a home kitchen keeps. What tips a loaf into group 4 is an ingredient NOVA lists as rarely used in kitchens (gluten, whey) or a cosmetic additive like an emulsifier, flavor or color. NOVA’s authors put freshly made bread in group 3, and say industrial bread of flour, water, salt and yeast stays there too.

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Add a food

ProteinBread and grainsVegetablesFruitSpreads and saucesDrinksSnacks and sweetsTakeout

White rice1Brown rice1Quinoa1Couscous1Pasta1Whole wheat pasta1Oatmeal1White bread4Whole wheat bread4Bagel4Flour tortilla4Corn tortilla3Pita4Pancakes4Granola4Corn flakes4Bakery sourdough3

Nutrition sits beside it

Two slices of bakery sourdough come to about 138 calories, 4 g of protein and 1.6 g of fiber in the site’s food table (USDA). Two slices of packaged whole wheat are about 138 calories, 6 g of protein and 3.8 g of fiber. The sourdough wins on the label, and the whole wheat wins on fiber. A whole wheat sourdough of flour, water and salt gets you both.

What we’d do

• Check the list before you trust the name. Flour, water, salt and starter is the one.
• Skip loaves with added gluten if you’re choosing sourdough to avoid group 4.
• Compare it with the other loaves in the swap ladder.