What is Brewers Yeast?
Brewers yeast, scientifically known as Saccharomyces cerevisiae, is a type of yeast produced as a byproduct of brewing beer. The form used as a supplement is deactivated (non-living) through heat treatment. It is a source of B-complex vitamins, chromium, protein, and minerals. It differs from nutritional yeast, which is cultivated for food and has a cheesy flavor, while brewer's yeast is bitter.
Potential Health Benefits of Brewers Yeast
Nutritional Powerhouse
Deactivated brewer's yeast is a good source of B vitamins (B1, B2, B3, B5, B6, B9), though it lacks B12 unless fortified. These vitamins are important for metabolism, nerve function, and skin. It also contains protein and minerals like chromium, selenium, and zinc.
Supporting Digestive and Gut Health
Brewer's yeast supplements may help with digestion and gut health due to probiotic properties. A review indicated that individuals with IBS taking brewer's yeast saw significant symptom reduction compared to placebo. It may also help relieve diarrhea.
Blood Sugar Management
Brewer's yeast shows promise for managing blood sugar, especially in type 2 diabetes. It contains glucose tolerance factor (GTF) chromium, which can improve insulin response. Early studies suggest daily supplementation can lower fasting blood sugar and HbA1c.
Boosting Immune Function
The beta-glucans and mannan oligosaccharides in brewer's yeast may stimulate the immune system. Studies suggest supplements can decrease the frequency of upper respiratory infections like the common cold. It also provides antioxidant minerals like selenium.
Risks, Side Effects, and Contraindications
Common Side Effects
Higher doses of brewer's yeast can cause side effects such as stomach discomfort, gas, bloating, and headaches. It is generally recommended for short-term use.
Drug Interactions and Contraindications
Its high tyramine content can lead to a dangerous blood pressure increase (hypertensive crisis) when taken with MAOIs. It may also cause low blood sugar (hypoglycemia) in those taking diabetes medications and can interfere with antifungal drugs.
Who Should Avoid Brewers Yeast?
Avoid brewer's yeast if you have:
- Yeast Allergies: May cause itching or swelling.
- Crohn's Disease: Can worsen symptoms.
- Compromised Immune Systems: Risk of fungal infection.
- Recurrent Yeast Infections: May exacerbate the condition.
- Pregnancy or Breastfeeding: Safety is not established, so avoid use.
Brewer's Yeast vs. Nutritional Yeast
Consult the table for key differences:
| Feature | Brewers Yeast | Nutritional Yeast |
|---|---|---|
| Source | Beer brewing byproduct | Grown for food |
| Flavor | Bitter from hops | Cheesy, nutty |
| Chromium | Good natural source | Contains chromium if fortified |
| Vitamin B12 | Not naturally present unless fortified | Almost always fortified |
| Intended Use | Supplementation for health issues | Culinary use and supplement |
| Texture | Flakes, tablets, powder | Flakes, powder |
Conclusion: So, is brewers yeast good or bad for you?
Brewers yeast offers benefits as a source of B vitamins and chromium, potentially helping gut health, blood sugar, and immunity for many healthy individuals. However, it comes with risks. Its bitter taste and side effects like gas and bloating are possible. Critically, it is not suitable for certain medical conditions and interacts with specific medications like antidepressants and diabetes drugs.
Consult a healthcare professional before using brewer's yeast to assess potential benefits against your health and medications. Nutritional yeast might be a better option for those needing vegan B12 or seeking a palatable food additive. Informed decisions with medical guidance are key for supplement use.
Brewer's Yeast: Health Benefits, Side Effects, Uses | RxList
