When people consider what causes high blood pressure , they often think of lifestyle factors, such as eating salty foods, lack of exercise, or smoking. However, an unexpected source of salt might also be raising blood pressure for millions of people: the water they drink . As sea levels rise, more and more saltwater tends to infiltrate global freshwater sources. I'm a public health researcher , and this raised a question for my team: Could saltwater intrusion be increasing the risk of high