Have you opened your sourdough starter jar and noticed a strong smell of alcohol, beer, wine, or even nail polish remover?
Don't worry. In most cases, this is completely normal and simply means that your starter is hungry.
Why Does It Happen?
A sourdough starter contains wild yeast and beneficial bacteria. As they consume the available nutrients in the flour, they produce gases, acids, and alcohol.
When the starter goes too long without feeding, alcohol begins to accumulate, creating a strong smell.
This is especially common during hot weather when fermentation happens much faster.
Signs That Your Starter Is Hungry
A hungry starter often shows several signs:
Strong alcohol smell
Liquid layer on top (called hooch)
Starter has risen and completely collapsed
Sour, sharp aroma
Slower activity after feeding
These signs usually indicate that the microorganisms have consumed most of the available food.
Is an Alcohol Smell Bad?
Not necessarily.
A mild alcohol smell is usually a sign that the starter needs fresh flour and water.
However, if you notice:
Pink, orange, or green spots
Fuzzy mold
A rotten or unpleasant smell
the starter may be contaminated and should be discarded.
How to Fix It
The solution is simple: feed your starter more often.
Try these steps:
Discard a portion of the starter.
Feed with fresh flour and water.
Keep it at a stable temperature.
Increase feeding frequency during hot weather.
Many bakers feed twice a day when temperatures rise above 28°C (82°F).
Hot Weather Tips
During summer, a starter may ferment much faster than expected.
To slow fermentation:
Use cooler water for feeding.
Move the jar to a cooler room.
Place the starter in a bowl of cool water.
Wrap the container with a damp towel.
Reduce the amount of mature starter in the feeding ratio.
If your sourdough starter smells like alcohol, it is usually a sign that it is hungry rather than unhealthy.
A fresh feeding is often all it needs to return to a pleasant aroma and strong fermentation activity.
Learning to recognize this smell will help you maintain a healthy and active sourdough starter all year round.