<P> Bread is used as an ingredient in other culinary preparations, such as the use of breadcrumbs to provide crunchy crusts or thicken sauces, sweet or savoury bread puddings, or as a binding agent in sausages and other ground meat products . </P> <P> Nutritionally, bread is known as an ample source for the grains category of nutrition and a good source of carbohydrates through the whole grains and nutrients such as magnesium, iron, selenium, B vitamins, and dietary fiber . </P> <P> The bread crust is formed from surface dough during the cooking process . It is hardened and browned through the Maillard reaction using the sugars and amino acids and the intense heat at the bread surface . The crust of most breads is harder, and more complexly and intensely flavored, than the rest . Old wives tales suggest that eating the bread crust makes a person's hair curlier . Additionally, the crust is rumored to be healthier than the rest . Some studies have shown that this is true as the crust has more dietary fiber and antioxidants such as pronyl - lysine, which is being researched for its potential colorectal cancer inhibitory properties . </P> <P> Doughs are usually baked, but in some cuisines breads are steamed (e.g., mantou), fried (e.g., puri), or baked on an unoiled frying pan (e.g., tortillas). It may be leavened or unleavened (e.g. matzo). Salt, fat and leavening agents such as yeast and baking soda are common ingredients, though bread may contain other ingredients, such as milk, egg, sugar, spice, fruit such as raisins, vegetables such as onion, nuts such as walnut or seeds such as poppy . </P>

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