Nutritional Yeast
Definition
What 'Nutritional Yeast' means
Nutritional yeast is a deactivated strain of Saccharomyces cerevisiae sold as yellow flakes or powder. It provides a savory, umami flavor and is commonly fortified with vitamin B12, making it a staple in vegan diets for mimicking cheese in sauces and toppings.
Related terms
In depth
The longer answer
Nutritional yeast is a deactivated form of the yeast species Saccharomyces cerevisiae, sold as yellow flakes or powder. It is widely used in plant-based cooking as a cheese substitute, a savoury seasoning, and a source of B vitamins. Consumers typically encounter it in health-food stores, bulk bins, or the baking aisle, often labelled as "nooch" by enthusiasts. Its nutty, umami flavour makes it a staple for vegan mac and cheese, popcorn toppings, and creamy sauces.
Commercially, nutritional yeast is produced by fermenting molasses or beet sugar with yeast cultures, then harvesting, washing, and heat-drying the cells to deactivate them. This process kills the yeast, preventing it from leavening or fermenting further. The final product is often fortified with synthetic B12, making it one of the few reliable plant-based sources of this essential vitamin. The flakes are light and brittle, easily crumbling into dishes without altering texture significantly.
For those eating plant-based, nutritional yeast offers a convenient way to add savoury depth and B12 without animal products. However, it is not a whole food; it is processed and can be high in sodium in some brands. Its B12 content depends entirely on fortification, and unfortified varieties provide none. Relying solely on nutritional yeast for B12 is unwise; a dedicated supplement remains the safest bet for meeting daily needs.
At a glance
Quick facts
| Detail | What to know |
|---|---|
| Primary source | Deactivated Saccharomyces cerevisiae yeast |
| Common form | Yellow flakes or fine powder |
| B12 fortification | Added in most commercial brands |
| Typical serving size | 1 to 2 tablespoons (5-15 grams) |
In practice
What this means for you
- Check the label for "fortified" to ensure B12 is added; unfortified varieties lack this key nutrient entirely.
- Store in a cool, dark cupboard in an airtight container; it stays fresh for up to two years.
- Sprinkle directly onto popcorn, pasta, or roasted vegetables for an instant cheesy, nutty flavour boost.
- Use as a thickener in sauces or soups; it blends smoothly without clumping when whisked into liquids.
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