The different types of yeasts are Brewers Yeast, Torula Yeast and Bakers Yeast. Their uses in the food industry differ and their nutritional effect in the body also differ. Some yeasts are beneficial for health and some cause negative effects on the body. Yeasts are also found in other foods such as Vegemite and fungus.Whether a yeast is positive or negative for health also depends on the amount consumed, sensitivities or allergies or if Candida is present.ot so beneficial yeasts. The problem with yeast from a health perspective is that yeast may feed detrimental bacteria such as Candida and contribute to asthma, Crohns Disease and gout. It is therefore recommended to reduce or eliminate the consumption of yeasts if you are afflicted with these conditions.
When zombies 'infect' villagers and turn the testificates into villager-zombies, you can turn the back by splashing them with a weakness potion and then right-clicking on them with a golden apple (the regular golden apple, not the shiny purple variety). Get it here-http://www.mojang.com/2012/08/the-wee...
Now there is also a leader zombie, which spawns rather rarely (5%) and can always break doors. It also has more health (1-4 hearts) and higher chance to spawn reinforcements (50-75%). So generally speaking, your villages with exposed doors will probably be fine for a much longer time than before 1.8.