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This produces bubbles of carbon dioxide which makes the dough rise. This kind of leavening requires proofing ie a resting time to allow the yeast time to reproduce and consume carbohydrates. Breads leavened with yeast have a distinctive flavour. A sourdough starter is a paste of flour and water containing yeast and lactobacilli which has been obtained from a previous batch of dough. It works in the same way as yeast by creating bubbles but it requires much more proofing time than yeast. Sourdough bread has a sour tangy taste. It is used for rye-based breads where yeast is not really effective in leavening the dough. Chemical leaveners are chemical mixtures that release carbon dioxide or other gases when they react to moisture and heat.
As you can see bread can contain ingredients that those of us who have type 2 diabetes need to avoid... salt and fats. It pays to check the labels. Leavening Leavening is the adding of gas to the dough creating bubbles that make it swell up. This makes the bread lighter and easier to chew. When flour and water are combined to make dough the starch in the flour mixes with the water to form a matrix. When this mixture is leavened (ie gas is added) the dough rises . Then when it sets the bubbles remain trapped in the dough. There are several ways dough can be leavened. However most types of bread are leavened using biological agents containing micro-organisms that release carbon dioxide as part of their life-cycle. These are either yeasts or sourdough starters. Yeast ferments some of the carbohydrates in the flour.
The most popular is baking powder a mixture of a carbonate or bicarbonate (usually sodium bicarbonate) and one or more acid salts. Baking powder works by releasing carbon dioxide gas into the dough when it gets wet creating bubbles that expand the wet mixture. It is used instead of yeast for breads where the flavours of fermentation would be undesirable or where the dough lacks the elastic structure needed to hold gas bubbles for more than a few minutes. Because carbon dioxide is released at a faster rate through the acid-base reaction than through fermentation breads made by chemical leavening are called quick breads. Examples of quick breads include Irish soda bread banana bread pancakes carrot cake and muffins.The big question for diabetics of course is whether the rising method has any effect on the glycemic index (GI) value of the bread.