We used a randomized crossover design whereby forty subjects ( 15 men , 25 women ) with a mean SD age of 21 2 y and BMI of 21.5 1.7 kg/m ( 2 ) consumed a fixed portion of a non-caloric sweetened ( NS ) and sugar sweetened ( SS ) versions of either a soft drink or a yoghurt drink ( counterbalanced ) for breakfast which were distinguishable by means of colored labels .