Nutritional yeast, a deactivated form of brewer's yeast, has emerged as a popular ingredient among health enthusiasts and online food personalities. This cheesy-tasting yellow powder is being incorporated into a wide array of savory dishes, from salads and marinades to pasta sauces, offering a dairy-free cheese-like flavor.
Once primarily found in health food stores and favored by vegetarians and vegans, nutritional yeast is now widely available in most supermarkets. Celebrities and influencers, including Jamie Oliver and TikTok star Baked By Melissa, have featured the ingredient in their recipes, highlighting its versatility and purported health advantages.
Dietitians and wellness advocates suggest that nutritional yeast can be a simple, healthful way to enhance the taste of meat-free meals. They point to its low calorie count, rich content of energy-boosting vitamins, and contribution to protein intake. A single tablespoon contains approximately 35 calories, with negligible fat, sugar, or salt, making it an attractive addition to a calorie-conscious diet.
What is Nutritional Yeast?
Nutritional yeast is processed as a seasoning, available in powder, flakes, or capsule forms. It is created by fermenting Saccharomyces cerevisiae with a sugar source like molasses in an oxygen-rich environment. After fermentation, the yeast is harvested, heated, and dried to deactivate it and preserve its nutrients. This heating process also develops its characteristic cheesy, umami flavor, attributed partly to the amino acid glutamate.
The product first gained commercial attention in the 1950s following the discovery of the high nutritional value of surplus brewer's yeast.
Health Benefits and Considerations
According to registered dietitian Sophie Medlin, a significant benefit of nutritional yeast is its high concentration of Vitamin B12. A tablespoon provides about 7.1 micrograms of B12, which is nearly five times the recommended daily intake. Vitamin B12 is crucial for energy metabolism, and deficiencies can lead to extreme tiredness. This makes nutritional yeast particularly valuable for individuals following vegan diets, as plant-based foods typically contain very little B12. Studies indicate a significant percentage of vegans may be deficient in this vitamin.
Beyond vegans, a notable portion of the general population, particularly older adults, also have insufficient B12 levels. Nutritional yeast can help bridge this gap. Furthermore, a tablespoon offers roughly the protein content of a large egg white, which can promote satiety and support muscle growth. It also provides a small amount of fiber, contributing to digestive health.
Many commercial nutritional yeast products are fortified with additional minerals like iron, zinc, and chromium, as well as other B vitamins such as folate, which can support immunity and cardiovascular health.
Who Should Use Nutritional Yeast Sparingly?
Individuals with irritable bowel syndrome (IBS) may need to consume nutritional yeast with caution, as its fiber content can trigger bloating and gas due to fermentation in the gut. Those already taking high-dose B vitamin supplements should also moderate their intake to avoid potential side effects from excessive B vitamins, which can include stomach upset, skin rashes, and blood pressure fluctuations.
Additionally, nutritional yeast contains tyramine, a compound that can be a trigger for migraines in susceptible individuals. Medlin suggests using it as a flavorful, lower-fat alternative to Parmesan cheese in dishes like pesto and pasta sauces, or sprinkled over roasted vegetables to add depth of flavor.