How many more years do you have to go? http://www.gstmantra.in/2017/09/29/24495/ buy desloratadine Even if youâve downed soda exclusively for years, your potassium levels and markers for normal heart function can improve in as little as one week, says Saoudi. However, if your potassium levels are already low (the case for 98 percent of Americans, according to the CDC), you should probably drink even less soda than the recommended daily limit of one 16-ounce bottle a day.