They reduce the calories but not the aditives.

 As you can see they say that is with a 50% less of calories,they only write it to attract you to buy it,because it has an aditve called suclarosa that it remplacates sugar but is worse than sugar, drinking this you only ingest aditives and calories like:

E-1422: Adipato Dialmidon Acetilado(PRECAUCION).

E-331: CItratos de Sodio(INOFENSIVO).

E-460:celulosa microcristalina(PRECAUCION).

E-466:carboximetilcelulosa de sodio(PRECAUCION).

E-407:carragenanos(EVITAR).

E-472:esteres de los mono y digliceridos de los acidos grasos(PRECAUCION).

E-471:mono y digliceridos de los acidos grasos.(PRECAUCION)

E-950:acesulfamo k(EVITAR).

http://www.lagastrotecadefelix.com/2013/06/lo-que-no-es-horchata/

http://www.aditivos-alimentarios.com/