A carbohydrate blend is provided, including at least fructose and glucose. Some or all of the glucose may be provided by glucooligosaccharides having a structure containing up to ten degrees of saccharide polymerization. An aqueous solution having 6% by weight of the carbohydrate blend has a measured osmolality of 230-300 mOsm/kg. Further, the measured osmolality of the carbohydrate solution is substantially stable during storage for up to six months. Also, a rehydration/sports beverage composition is provided, including water, a carbohydrate blend, electrolytes, and optionally edible acids, coloring agents, flavoring agents and the like. The beverage composition may have a measured osmolality of about 230-260 mOsm/kg, which provides faster absorption by the gastrointestinal system of a subject than a beverage composition with a higher osmolality.