Are food dyes in processed snacks and drinks linked to heart disease?

What's actually in it

Synthetic food dyes give processed foods their eye-catching colors. Red 40, Yellow 5, Yellow 6, and Blue 1 are the most common in the U.S. You'll find them in candy, cereal, sports drinks, flavored yogurt, chips, frosting, and even some breads and pickles. Kids eat more of these dyes per pound of body weight than adults because their diets lean heavily on brightly colored snacks and drinks.

These dyes are made from petroleum-derived chemicals. They add zero nutritional value. Their only job is to make food look more appealing.

What the research says

A 2026 review in Cardiol Rev looked at food dyes and processed food ingredients through the lens of cardiovascular risk. The researchers reviewed evidence connecting synthetic dyes to inflammation, oxidative stress, and metabolic disruption, all of which are key drivers of heart disease.

Synthetic dyes can trigger chronic low-grade inflammation in the body. Inflammation damages blood vessel walls over time and is one of the main ways heart disease develops. Some dyes also increase oxidative stress, which means your cells produce more damaging free radicals than your body can neutralize.

The problem isn't just the dyes in isolation. It's the whole package. Foods loaded with synthetic dyes also tend to be ultra-processed, packed with added sugars, refined oils, and other additives that independently raise heart disease risk. The dyes are a marker of the kind of food that's worst for your cardiovascular system, and they may add their own layer of harm on top.

The European Union already requires warning labels on foods with certain dyes, stating they "may have an adverse effect on activity and attention in children." The U.S. doesn't require these labels.

Cutting back is simple: check ingredient lists for color names and numbers. Choose products colored with real ingredients like beet juice, turmeric, or paprika extract. Or better yet, choose snacks and drinks that don't need artificial color at all.