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The intuitive answer is that it must worsen the GI value because it introduces air into the matrix. But according to researchers in New Zealand the leavening agents used in making bread do not have any impact on the GI of the bread. Types of bread There are hundreds of different breads in the world. Here are a few of the most common. Notice the subtle differences which may or may not be designed to confuse the consumer. White bread is made from refined flour ie grain from which the bran and germ have been removed so that it only contains the endosperm (the central core of the grain). By contrast wholemeal bread is made from the whole of the wheat grain (endosperm bran and germ) ie from unrefined flour. Brown bread is not the same as wholemeal bread.
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.
In fact brown bread is nothing more than white bread to which a (usually caramel-based) colouring has been added to make it brown; it may also have up to 10% added bran. Whole-grain bead is white bread to which whole grains have been added to increase its fibre content; eg 60% whole-grain bread . It is not the same as wholemeal bread which is made from 100% whole grains. Granary bread is made from flaked wheat grains and white or brown flour. Wheat germ bread is any kind of bread to which wheat germ has been added for flavouring. Rye bread is bread made with rye rather than wheat. It has more fibre than most other breads a darker colour and a stronger flavour. Crisp bread is a flat and dry type of bread or cracker made mostly of rye flour.