(Reuters) -PepsiCo does not intend to change its product portfolio following a report that artificial sweetener aspartame was set to be declared a possible carcinogen, Chief Financial Officer Hugh Jonston told Reuters on Thursday. Aspartame, will be listed as "possibly carcinogenic to humans" on July 14 for the first time by the International Agency for Research on Cancer (IARC), the World Health Organization's (WHO) cancer research arm, Reuters reported in June. The ingredient is one of the world's most widely used artificial sweeteners, found in products ranging from Co...