Question 1

Why does bread go stale if it's sealed in a bag?

Accepted Answer

Sealed bread still goes stale because staling is not about losing water to the air. It is caused by starch retrogradation, in which the starch molecules recrystallize and squeeze out water internally, stiffening the crumb even though no moisture has left the loaf.

Question 2

Why does toasting stale bread make it soft again?

Accepted Answer

Toasting heats the bread past about 54 to 60 degrees Celsius, which melts the retrograded starch crystals that formed on cooling. The starch chains loosen and reabsorb the trapped water, briefly restoring a fresh, soft texture until the crystals reform on cooling.

Question 3

Does keeping bread in the fridge keep it fresh longer?

Accepted Answer

No. The refrigerator actually speeds up staling. Cold-but-not-frozen temperatures near a fridge's range accelerate starch retrogradation, so bread stales several times faster there than on the counter. Freezing solid stops staling entirely.

baking

All essays in .

The Bread That Crystallized Itself