IF you have high blood pressure, you’re in good company. Hypertension afflicts 67 million Americans, including nearly two-thirds of people over age 60. But it isn’t an inevitable part of the aging process. It’s better to think of it as chronic sodium intoxication. And, as an important new study from Britain shows, there’s a way to prevent the problem — and to save many, many lives.

A lifetime of consuming too much sodium (mostly in the form of sodium chloride, or table salt) raises blood pressure, and high blood pressure kills and disables people by triggering strokes and heart attacks. In the United States, according to best estimates, excess sodium is killing between 40,000 and 90,000 people and running up to $20 billion in medical costs a year.

Americans on average take in about 3,300 milligrams of sodium per day, but experts recommend less than 2,300 milligrams — and less than 1,500 milligrams for people over age 50, black people, or those who already have hypertension, diabetes or kidney disease, which adds up to a majority of American adults. Either target is far below where most Americans are now.

The reason that nearly everyone eats way too much sodium is that our food is loaded with it, and often where we don’t taste or expect it. Of course ham and canned soup are full of salt, but so are many foods that are surprising: A blueberry muffin can have more than double the salt of a serving of potato chips. Even healthy-sounding food can pack heavy sodium loads. Two slices of whole wheat bread can have nearly 400 milligrams of sodium, as can two tablespoons of fat-free salad dressing. Eight ounces of V8 vegetable juice contains well over 500 milligrams. Many restaurant entrees have far more sodium than is recommended for an entire day. Applebee’s lemon shrimp fettuccine, at 5,100 milligrams, has more than twice as much.