New medical guidelines lower the threshold for high blood pressure, adding 30 million Americans to those who have the condition.
That means now nearly half of US adults have stage 1 hypertension and need to make urgent lifestyle changes to bring that number down.
High pressure has long meant a top reading of at least 140 or a bottom one of 90, but that has dropped to 130/80, according to a report published by the American Heart Association on Monday.
The change reclassifies 14 percent of US adults, who were once deemed 'high normal' and now have a more critical diagnosis.
Experts have hailed the shift amid swelling obesity rates and poor nutrition.
New guidelines published by the American Heart Association on Monday add 30 million Americans to the 'hypertension' bracket, meaning they need to change their lifestyle habits
Former CDC director Dr Tom Frieden, who is now