“Tighter blood pressure guidelines from U.S. heart organizations mean millions more people need to make lifestyle changes, or start taking medication, in order to avoid cardiovascular problems. At the new cutoff, around 46 percent, or more than 103 million, of American adults are considered to have high blood pressure, compared with an estimated 72 million under the previous guidelines in place since 2003. Potentially deadly high blood pressure can be brought under control with a wide array of medications.”