My two years old son likes to eat sweet things more than salty.... I am worried.. Would it be harmful for him in future???

none of these are healthy in the long run - whether it is a like for too much sweet or too much salt. i think don't stress too much if he likes sweet things more than salty ones, as it is also a matter of personal taste. having a sweet tooth can definitely be a cause for concern in the long run, but you can try and introduce healthy sources of 'sweet' to him. use more of honey, jaggery and dates and try to prepare the 'sweet' things at home instead of store-bought ones.