People with allergic reaction to molds may have a reaction. Bread also lacks vitamins and minerals that can be made up with other food groups. Remember that, Man can not live on bread alone. Bread is really not that fattening. One slice of regular white bread is about 80 calories.
White bread contains iron, niacin and calcium.
Rye bread, one slice also contains approximately 65 calories, and is a good source of Iron and thiamine. Pumpernickel, may be an unusual name but is a good source of fiber, one slice is about 80 calories and also contains Iron and Thiamine. Whole wheat breads are a good source of Iron and contain about 60 calories per slice. Bagels, English muffins, and Pitas are all good sources of Iron. These are higher in calories, ranging from 105 to 165 calories per piece.