Nitric oxide is involved in regulating blood-vessel dilation, meaning it helps blood vessels relax and widen.

Research has found that dietary nitrate can influence blood pressure and vascular function, although the magnitude of the effect varies between individuals.

This does not mean drinking beet juice will instantly “clear blocked arteries.”

It means beetroot can be one component of a diet that supports normal vascular function.

Leafy green vegetables are another important category.

Spinach, arugula, lettuce, Swiss chard, and similar vegetables can provide nitrates, potassium, folate, magnesium, and numerous plant compounds.

They also tend to be low in calories while providing substantial nutritional value.

That makes them particularly useful as replacements for less nutritious foods.

Then there are berries.

Blueberries, strawberries, blackberries, and other berries provide polyphenols and other antioxidant compounds.

Oxidative stress and inflammation are involved in many chronic diseases, including cardiovascular disease. A diet rich in fruits and vegetables provides a broad variety of compounds that support overall health.

Citrus fruits are another useful addition.

Oranges, grapefruit, lemons, and related fruits provide vitamin C and flavonoids. Whole fruit also provides fiber, which is generally preferable to consuming fruit primarily as juice.

The distinction matters because juice can contain a substantial amount of naturally occurring sugar while providing less fiber than whole fruit.

Pomegranates are also frequently discussed in cardiovascular nutrition because they contain polyphenols.

Research into pomegranate and vascular health has produced interesting findings, but it is important not to exaggerate them.

A food containing potentially beneficial compounds does not automatically function as a medicine.

The strongest nutritional strategy is variety.

Instead of searching for one “superfood,” think about building meals containing multiple plant foods.

A breakfast might include berries and oats.

Lunch could contain a large serving of leafy greens.

Dinner might include roasted vegetables and beans.

Over time, those small choices create a dietary pattern rich in fiber, minerals, and plant compounds.

That pattern is much more meaningful than consuming one supposedly miraculous food occasionally.

The same principle applies to blood pressure.

Potassium-rich foods can be helpful for many people because potassium plays a role in fluid balance and blood-pressure regulation.

But people with certain kidney conditions or those taking medications that affect potassium may need individualized advice.

Even healthy foods are not universally appropriate in unlimited quantities.

Nutrition works best when it is adapted to the person.

Chapter 3 — Fatty Fish, Nuts, and Foods That Support the Cardiovascular System

Not all dietary fat is the same.

One of the most useful changes people can make is replacing some sources of saturated fat with foods rich in unsaturated fats.

Fatty fish are particularly valuable.