And if anything, Trader Joe's Sourdough Sliced Bread is above average for store-bought pre-sliced sourdough. It's got just the right amount of tang and sourness, and just the right amount of wheat and barley goodness.

White sourdough is healthier than white bread made with commercial yeast. But the healthiest sourdoughs are made with wholegrain flour, sourdough starter, water, and a little salt. Intact grains, herbs, spices, or nuts and seeds can also give the breads distinct flavors.

Sourdough bread is also an excellent source of antioxidants. Studies have shown that antioxidants like the peptides found in sourdough can lower the risk for certain types of cancer, signs of aging, or chronic diseases like rheumatoid arthritis.

Despite the fact that traditional sourdough ingredients are flour, water, and salt, many store-bought versions include added yeast, ascorbic acid, vinegar, and oil. So, although many grocery stores may carry bread labeled “sourdough”, more often than not they are in fact fake sourdough.