A low sodium diet is a diet that includes no more than 1,500 to 2,400 mg of sodium per day. (One teaspoon of salt has about 2,300 mg sodium.) People who follow a vigorous or moderate exercise schedule are usually advised to limit their sodium intake to 3,000 mg per day and those with moderate to severe heart failure are usually advised to limit their sodium intake to 2,000 mg per day. The human minimum requirement for sodium in the diet is about 500 mg per day, which is typically less than one-sixth as much as many diets 'seasoned to taste'. For certain people with salt-sensitive blood pressure, this extra intake may cause a negative effect on health. A Cochrane review published in 2008 concluded that a long term (more than 4 weeks) low sodium diet in Caucasians has a useful effect to reduce blood pressure, both in people with hypertension and in people with normal blood pressure. Taken together, a low salt diet (median of approximately 4.