You've probably been told your entire life that too much sodium is bad for you. Now, new research suggests that a diet low in sodium may actually be harmful. The collection of four studies, published in the journal The Lancet, followed more than 100,000 participants—some with high blood pressure, some without—from nearly 50 countries for almost four years. The researchers found that people with a low sodium intake (less than 3,000 mg) experienced a higher risk of heart attack, stroke, or heart failure, compared to people who consumed between 3,000 mg and 6,000 mg a day.