The gut-healing, heart-loving nutrient your meals often miss: Cardiologist reveals how it can tame blood pressure and sugar

When people think of heart health, the focus is often on what to cut out — salt, sugar and saturated fats usually top the list. But according to Dr. Adedapo Iluyomade, a preventive cardiologist at Miami Cardiac & Vascular Institute, there’s one simple dietary addition that can have a bigger impact than many realize: fiber.

Speaking to Eating Well, Dr. Iluyomade called fiber “one of the most important yet underrated nutrients for cardiovascular health.” He explained that it not only improves cholesterol and blood pressure, but also plays a vital role in stabilizing blood sugar and supporting the gut microbiome.

Why Fiber Deserves a Spot at the Heart-Healthy Table

While fiber’s role in digestive health is well-known, its impact on the heart is often overlooked. Soluble fiber, in particular, has been shown to lower LDL (“bad”) cholesterol by binding to bile acids in the small intestine. This forces the liver to use cholesterol from the blood to make new bile, naturally reducing harmful cholesterol levels.


The most potent sources include oats, barley, psyllium husk, apples, pears, sweet potatoes, beans and lentils.

The Blood Pressure Connection

Beyond cholesterol, research shows fiber may have a modest but meaningful effect on blood pressure. Dr. Iluyomade pointed to a meta-analysis of 83 studies that found consuming just five extra grams of soluble fiber per day could significantly lower blood pressure.

The benefits may come from a combination of factors — fiber-rich foods often replace higher sodium options, promote healthy gut bacteria and produce compounds that help relax blood vessels.

Fiber also acts as a steadying force for blood sugar levels. “It’s like a traffic cop for carbs,” Dr. Iluyomade told Eating Well. By slowing the rate at which sugar enters the bloodstream, fiber helps prevent spikes and dips that can harm long-term cardiovascular health. Over time, this contributes to better insulin sensitivity and weight management.

Easy Ways to Add More Fiber to Your Diet

Dr. Iluyomade says small, consistent changes can yield big results. He suggests:

• Starting the day with oats or barley for a dose of beta-glucan
• Swapping animal protein for fiber-rich plant proteins like beans or tofu
• Incorporating more fruits and vegetables, especially in mixed dishes
• Adding nuts and seeds to salads, yogurt or grain bowls for extra crunch and fiber

A Small Change with a Big Payoff

The American Heart Association recommends at least 28 grams of fiber per day, yet most people fall short. By making fiber a priority, you’re not only improving digestion — you’re strengthening your heart, balancing your blood sugar and potentially lowering blood pressure.

As Dr. Iluyomade puts it, “It’s one of the simplest, most effective steps you can take for your cardiovascular health.”