A carbohydrate mixture for dietetic foods and pharmaceuticals is provided. The carbohydrate mixture comprises two different, substantially soluble carbohydrate components A and B, which remain undigested in the gastrointestinal tract and enter the large intestine without being resorbed. Carbohydrate component A may comprise at least one monosaccharide or of at least one oligosaccharide (disaccharide to hexasaccharide) or a mixture of two or more of these saccharides. Carbohydrate component B may comprise a polysaccharide (from heptasaccharide onwards) or a mixture of two or more polysaccharides. Carbohydrate component A=5 to 95 wt-% and carbohydrate component B=5 to 95 wt-% of the sum of the carbohydrate components A+B (=100 wt-%), and at least 80 wt-% of the carbohydrates/saccharides of both carbohydrate components have a prebiotic effect. The carbohydrate mixtures have not only a nutritive effect but they also stimulate health-promoting microorganisms present in the natural flora of the large intestine.