Sugar is an important nutrient that serves as a source of energy, and is crucial to maintaining bodily functions. As such parts of the body as the brain, nerves, and red blood cells are unable to use any sugars other than the monosaccharide glucose, it would be fair to say that sugar truly is a fundamental molecule with a direct connection to life itself. Its flavor and properties are essential in cooking, and its sweetness broadens the pleasure of eating. As such, sugar is an important presence in food, too. It also has a diverse array of other functions, including acting as a preservative, as it inhibits lipid oxidation, starch retrogradation, and protein denaturation. Understanding sugar properly and consuming an appropriate amount is the secret to staying healthy.