Monosaccharides are as small as carbohydrates get. Said another way, monosaccharides cannot be split into smaller carbohydrates. All other carbohydrates are made up of monosaccharides linked together. For instance, disaccharides are composed of two monosaccharides linked together. The three disaccharides found in our diet, including their monosaccharide building blocks, are listed in Table 4.1.
Glucose and fructose can be found in foods either independently or as part of larger carbohydrates. Fructose is what makes honey and many fruits sweet and is used commercially as a sweetener either as fructose or high-fructose corn syrup. On the other hand, while some galactose is found in certain foods, it is mostly found as part of larger carbohydrates.
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