Yeast and Bread
How does the amount of yeast
affect a loaf of bread?
The yeast cells in bread dough ferment sugars and
produce gas (carbon dioxide). This will make the dough
rise. If there is not enough yeast, the dough will not
rise sufficiently and become less fluffy after baking.
Without yeast you get unleavened bread. With too much
yeast the dough becomes very light, and in the oven
will collapse. in both cases the bread is still
completely safe to eat. The amount of yeast per bread
is very much a matter of taste and varies from country
Dr. T. Wassenaar
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Update: June 2012