Breads have been eaten by humans since around 4,000 B.C. Depending on the ingredients used, bread can contain varying amounts of calories, fats, protein and carbohydrates. Both sugar and fiber are different forms of carbohydrates found in foods. White bread is made using highly refined and bleached grains, which reduce fiber content while increasing the amount of sugar.
A slice of white bread, weighing approximately 25 g, contains only 1.08 g of sugar. White bread is a moderate calorie food that is also relatively low in fat, calories and protein. One slice provides 66 calories, 1.91 g of protein, 0.8 g of fat and 12.65 g of carbohydrate. White bread is made using refined grains, which reduces the overall fiber content, which totals 0.6 g of fiber per slice.
Wheat bread contains about 1.44 g sugar per slice. Slightly higher in protein, fat and fiber than white bread, a slice of wheat bread contains 66 calories, 2.73 g of protein, 0.91 g of fat, 11.8 g of carbohydrate and 0.9 g of fiber.
Rye bread provides only 0.96 g of sugar per serving. In addition, each slice of rye bread contains only 64 calories, 2.12 g of protein, 0.82 g of fat, 12.07 g of carbohydrate and 1.4 g of fiber. Rye bread provides more than twice the amount of fiber as white bread.
Compared to white, wheat and rye bread, multi-grain bread contains the most amount of sugar per slice. Multi-grain bread provides 1.66 g of sugar per serving. The additional grains in multi-grain breads also increase the caloric, fat and protein content. A slice of multi-grain bread contains 69 calories, 3.47 g of protein, 1.1 g of fat, 11.27 g of carbohydrate and 1.9 g of fiber.