|Yeast Quick Facts|
|Major nutrients||Vitamin B1 (36.67%)
Vitamin B9 (23.50%)
Vitamin B2 (12.31%)
Vitamin B5 (10.80%)
Vitamin B3 (10.05%)
|Health benefits||Strengthen immunity, Battle against cancer, Helpful for diarrhea, Antioxidant activity|
The yeast species Saccharomyces cerevisiae, by fermentation, changes carbohydrates to carbon dioxide or alcohols. For 1000 years, carbon dioxide is used in baking or alcohol in alcoholic beverages. Yeasts does not form phylogenetic or single taxonomic grouping. Yeast is used in manufacturing food to cause fermentation or leavening.
The term yeast is derived from Old English gyst, gist or from Indo-European root yes which means foam, boil or bubble. Perhaps yeast microbes are earliest domesticated organisms. Archaeologists found baking chambers and early grinding stones for yeast raised bread and drawings of 4000 year old breweries and bakeries. Anton van Leeuwenhoek, a Dutch naturalist, microscopically observed yeast but it was not considered to be living organisms but a globular structures. They were in doubt that whether yeasts were fungi or algae but Theodor Schwann in 1837 identified them as fungi.
In the late 18th century, two yeast strains have been identified for brewing: S. carlsbergensis (bottom-fermenting yeast) and Saccharomyces cerevisiae (top-fermenting yeast). Commercially, S.cerevisiae has been sold by Dutch for making bread since 1780 but around 1800, Germans started to produce S.cerevisiae in form of cream. Yeast blocks industrial production was reinforced by introduction of filter press in 1867. Baron Max de Springer advanced manufacturing process for forming granulated yeast, a technique which was used till First World War. In United States, airborne yeasts are used exclusively till commercial yeast was displayed in Philadelphia at Centennial Exposition in 1876. Charles L. Fleischmann viewed the product and process to use it and serving resultant baked bread. The yeast species, Saccharomyces cerevisiae has been used for long time. It is used as an additive for fermenting alcoholic drinks such as beer. It is regarded as a model organism for modern cell biology.
Health Benefits of Yeast
Let us know about the health benefits which yeast offers:
- Strengthen immunity
Talking about probiotic foods and yogurt, lactic acid based bacteria are most common. Similarly yeast provides similar safety against toxins and pathogens. Beta glucan fibers found in cell walls of yeast provide favorable effects on immune system. Yeast is much easy to make and is healthy too. In addition, yeast has more diverse enzyme profile referring yeast could provide more diverse benefits to immune system. It is a perfect substitute for those having lactose intolerance.
- Battle against cancer
Research have explored that use of baker’s yeast helps to protect from cancer. The consumption of yeast results in death of tumor cells and is observed in both colon and tongue cancer cells. It assures an alternative therapeutic option for gastrointestinal cancer. Study shows that heat destroyed non-pathogenic yeast such as brewer’s yeast and baker’s yeast which persuaded apoptosis of breast cancer cells. It clues that yeas has the potential to hold the spread of cancer.
- Helpful for diarrhea
Saccharomyces boulardii is useful for treating acute diarrhea and prevent the chances of traveler’s diarrhea. Brewer’s yeast prepared from Saccharomyces boulardii possess enzymes which counteract toxins effect associated to intake of antibiotics assisting to deal with unwarranted diarrhea.
- Antioxidant activity
Yeast contains selenium which is a vital mineral containing antioxidant properties counteracting the free radical effects/damage to the body. Insufficient presence of selenium in the body avails the chances of heart diseases and even cancer. Ample amounts help the body to prevent damage associated with toxins in food and environment. Yeast is a smart way to add this nutrient in smaller amounts.
Types of Yeast
- Compressed Yeast
It is the mixture of yeast and starch having moisture content about 70%. They should be kept refrigerated. It is creamy white or crumbly having fresh and yeasty smell.
- Active Dry Yeast
This yeast has all the moisture been removed by air. It makes the yeast dormant and could be stored in dry storage without refrigeration for several months. The active dry yeast is rehydrated in water having temperature of 40’C (105-110’F). It is known as activating yeast. The foam in surface of water with yeast means it is active and could be added to dough.
- Instant Dry Yeast
It is not needed to get activated. Instant dry yeast may not dissolve fully during mixing. Then the yeast is moistened in 5 times its weight in water.
How to Eat
- Use yeast in biscuits, cakes, pizza, frying batters and homemade bread.
- Yeast is used in making breads, beers and wines.
- Yeast has visible colonies which consist of one million cells.
- DNA of yeast is found inside nucleus. It also contains organelles and mitochondria.
- Yeast runs sugar from liquid to alcohol and carbon dioxide and enhance aroma of wine and beer.
- In species of yeast, mother cell isolate into two daughter cells known as fission.
- The cell of yeast has average lifespan of few days.
- It is classified in kingdom fungi.