Diet Pepsi, also called Pepsi Light in some countries, is a carbonated cola soft drink produced by PepsiCo. It is an alternative to Pepsi, containing no sugar, instead using artificial sweeteners. First test marketed in 1963 under the name Patio Diet Cola, it was re-branded as Diet Pepsi the following year, becoming the first diet cola to be distributed on a national scale in the United States before expanding internationally. In addition to Diet Pepsi, PepsiCo also produces the low-calorie cola Pepsi Zero Sugar, also called Pepsi Max in some areas, which was developed after Diet Pepsi.