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.

The soft bread holds up against soggy sandwich fillings and caramelizes evenly when exposed to heat. As a result, the Trader Joe's item attracts fans from across the internet. Its charm is in its subtlety. Unlike some highly fermented options, this grocery store version is mild in flavor and enjoyably wheaty.

Sourdough bread's fiber, potassium, phosphorus, and sodium content all support a heart-healthy diet. The soluble fiber found in sourdough bread binds to dietary cholesterol in the small intestine, helping pass this fat through the system instead of absorbing it.

All types of sourdough are relatively healthy, says Largeman-Roth, but the healthiest type of bread — sourdough or otherwise — is whole wheat or whole grain. Whole-grain bread is made with flour containing the entire wheat kernel.