Why Is My Sourdough Gummy Inside

A gummy crumb feels damp and pasty, sticks to the knife and compresses into a dense wad when pressed. It can look shiny, show tight streaks near the base, or leave a sticky film on your fingers. The cause is almost always water that never left the loaf or starch that never fully set.

There are five common culprits: a loaf pulled from the oven too soon, slicing while it is still hot, a dough that was not fermented long enough, more water than the flour could handle, and ingredients like rye, cheese or fruit that keep the crumb moist. Each leaves slightly different clues, so look closely at the slice before you change anything.

Read the slice

Where the gumminess sits tells you a lot. Moisture spread evenly through the whole loaf points to underbaking or early slicing. A tight, glossy layer along the bottom with big tunnels under the top crust is a fermentation problem. Damp pockets around add-ins point to the add-ins.

• Even dampness throughout, pale crust: underbaked
• Crumb sticky only near the center, cut warm: sliced too soon
• Dense bottom, irregular large holes on top, mild flavor: under-fermented
• Wet patches around cheese, fruit or seeds: wet inclusions
• Sticky, close crumb in a rye-heavy loaf: normal for rye; rest it longer

Underbaking

A crust can brown before the center is done, especially on large or very wet loaves. Use an instant-read thermometer through the base: lean loaves are fully baked around 96 to 99°C (205 to 210°F). Bake until the crust is a deep brown, not golden, and the loaf feels light for its size.

If the crust is dark but the inside reads low, lower the oven by about 15°C (25°F) and bake longer. After the lid comes off a Dutch oven, finishing the last 5 to 10 minutes with the loaf directly on the rack drives off more moisture.

Slicing too soon

When the loaf leaves the oven, the starch inside is still soft and saturated with steam. It firms as the bread cools and moisture moves outward. Cut it hot and the knife smears that soft gel, which stays gummy even after the slice cools.

Cool the loaf on a rack so air reaches the base, at least 2 hours for a standard loaf and longer for large or whole grain ones. If you want warm bread, reheat a cooled loaf at 175°C (350°F) for about 10 minutes.

Under-fermentation

Dough that goes into the oven too early has too little gas spread through it, and the starch around those pockets sets into a tight, wet-feeling mass. The loaf may also have a bulging ear or a crust that separates from the crumb.

Let bulk run until the dough has risen roughly 50 to 75 percent, feels airy and domed, and shows bubbles on the sides and top. A cool kitchen can stretch bulk to 7 hours or more. Use a straight-sided container with a mark so you can judge the rise rather than relying on the clock.

Too much water, rye and add-ins

Hydration that suits strong bread flour can overwhelm an all-purpose flour, leaving a crumb that never dries. Drop the water by 5 percent and work up again once the loaf is reliable. Rye contains gums that hold water, so rye-heavy breads are sticky by nature and need a long bake and a day of rest before slicing.

Fresh fruit, soft cheese and soaked seeds release water into the surrounding crumb. Pat soaked grains dry, use firm cheese in cubes rather than shreds, and keep add-ins to about 20 to 30 percent of the flour weight.

Saving a gummy loaf

If you catch an underbaked loaf right after slicing, put it back in a 175°C (350°F) oven for 10 to 20 minutes, then cool completely. It will not be perfect, but it improves. Gummy slices from an under-fermented loaf toast well and make excellent croutons or bread crumbs.

Common questions

Can too much starter cause a gummy crumb?

Indirectly. A very large or over-ripe levain brings acid and enzymes that weaken the dough and can leave a sticky crumb. Stay around 15 to 25 percent levain of the flour weight unless a recipe says otherwise.

My crumb looks fine but feels moist. Is it underbaked?

Not necessarily. Higher hydration loaves are meant to be moist and slightly custardy. If the crumb springs back when pressed and does not smear on the knife, it is done.

Does diastatic malt make bread gummy?

It can if overused. Diastatic malt adds enzymes that break starch into sugar. A small amount, around 0.5 to 1 percent of flour weight, helps browning, but more can turn the crumb sticky.