A study by Langford in 1983 observed that populations that consume less sodium also tend to have relatively high potassium intake, and a lower rate of CVD. Within the USA, he also noticed racial and class differences in CVD, which he suggests may be due to sodium being cheaper to acquire in the diet than potassium, since many products contain added salt. Reddy and Katan recommend a salt intake below 5 g/day (5000 mg/day), and to increase potassium intake by 2 - 3 g/day. The study emphasizes that this should be done through dietary changes, rather than by taking a dietary supplement containing potassium.
