What is Yeast? How This Tiny Fungus Makes Bread Rise
Have you ever wondered how a dense ball of flour and water transforms into a light, airy loaf of bread or a fluffy brioche? The secret lies in a single-celled living organism: yeast.
Scientifically known as Saccharomyces cerevisiae, yeast is the powerhouse of the baking world. Whether you are a novice or a pro, understanding how yeast works is the first step to mastering the art of bread making.
How Does Yeast Work in Baking?
Yeast is a type of fungus that feeds on the sugars and starches found in flour. When you add water and warmth, the yeast wakes up and begins a process called fermentation.
During fermentation, the yeast consumes carbohydrates and converts them into two main byproducts:
- Carbon Dioxide (CO2): These gas bubbles get trapped in the dough’s gluten network, causing the bread to rise.
- Alcohol (Ethanol): This evaporates during baking but leaves behind those complex, yeasty aromas we love.
Pro Tip: Yeast doesn’t just provide lift; it develops flavor. A slower rise usually results in a deeper, more professional-tasting crust and crumb.
The 3 Main Types of Baking Yeast
Not all yeast is created equal. Depending on your recipe and timeline, you’ll likely choose one of these three common forms:
1. Dry Yeast
This is the most common variety and found in two forms – Active Dry Yeast and Instant Dry Yeast. It consists of coarse vermicelli granules and is able to be stored and used at room temperature.
Instant dry yeast does not need to be activated before it’s added into your recipe, saving you plenty of preparation time.
2. Fresh Yeast (Compressed Yeast)
Compressed fresh baking yeast is the most popular choice for both industrial and craft bakers due to its practicality, consistent fermentation qualities, and ease of use during mixing.
It has a short shelf life (~4 weeks) and needs to be stored in the fridge. It is ideal for bakers who bake regularly or produce bread in large batches.
3. Frozen Yeast (also known as Free-Flowing Frozen Yeast (FFFY) or semi-dry yeast)
As frozen dough applications continue to grow in popularity across APAC’s dynamic baking industry, Frozen Yeast solution offers the perfect balance of performance, convenience, and quality.
This yeast was designed to support the growing needs of modern bakeries producing frozen dough products.
By combining the convenience and long shelf life of dry yeast with the high fermentation performance of fresh compressed yeast, Frozen Yeast offers bakers the best of both worlds.
Finding the perfect “Rise” Zone
Baking is a science of balance. The amount of yeast you use dictates the final texture:
- Too little yeast: Your bread will be dense, heavy, and “brick-like.”
- Too much yeast: The dough will rise too quickly, leading to large, uneven air pockets and a potential collapse in the oven.
By mastering the “fermentation dance”, you can move beyond basic loaves and start experimenting with a range of pastries, pizzas, and artisan boules.
Product availability varies by country. Please contact your local Lesaffre sales representative for the specific range available in your market.
