Dosa is high in carbohydrates and contains no added sugars or saturated fats. Carbohydrates can be polymers of simple sugars or the simple sugars themselves. They are attracted particularly to meats, starches, sugars, and fatty foods. Caramelization is a process that affects only sugars, or simple carbohydrates. Galactose and fructose are shown to be two of the best fermenting sugars. Acetoacetate is an intermediate in the Krebs cycle which releases energy from sugars and carbohydrates. Lactose is a disaccharide composite of two simple sugars, glucose and galactose. Certain bacteria in the mouth live off the remains of foods, especially sugars and starches. Oligosaccharides of glucose combined with other sugars serve as important energy stores. This is a list of sugars and sugar products. Lactose has relatively low cariogenicity among sugars. In fermentation, yeast ingests sugars and excretes ethanol. Treatment of hypoglycemia is by eating foods high in simple sugars or taking dextrose. Limes have higher contents of sugars and acids than lemons do.