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Best Functional Foods to Get Into Your Diet

By Joe Boland

June 25, 2026

The phrase “functional foods” has become increasingly popular as more people look for ways to support their health through everyday nutrition. While all foods provide nutrients, functional foods go a step further by offering compounds that may help support specific aspects of wellness beyond basic nourishment.

In many ways, functional foods embody the idea that food can play a powerful role in overall health. From antioxidant-rich berries and omega-3-packed fish to fermented foods that support gut health, these foods contain naturally occurring bioactive compounds that may help support healthy aging, immune system function, heart health, digestion and more when consumed as part of a balanced diet.

But what exactly qualifies as a functional food, and which foods deserve a place on your plate?

Here's what you need to know about functional foods, their potential benefits and some of the best examples to incorporate into a healthy lifestyle.

What are functional foods?

Functional foods are foods that provide health-promoting compounds beyond their basic nutritional value. In addition to supplying essential nutrients like protein, carbohydrates, fats, vitamins and minerals, they contain naturally occurring or added substances that may support specific physiological functions.

These beneficial compounds can include:

• Antioxidants

• Polyphenols

• Flavonoids

• Probiotics

• Prebiotics

• Omega-3 fatty acids

• Fiber

• Phytochemicals

• Bioactive peptides

Although there is no universally accepted regulatory definition of functional foods in the United States, nutrition researchers generally describe them as foods that may offer benefits beyond basic nutrition because of their unique bioactive components.

Research suggests that functional foods may play a role in supporting cardiovascular health, metabolic health, digestive wellness and healthy aging when included in an overall healthy dietary pattern.

Functional foods typically fall into two broad categories:

Conventional functional foods

These are whole foods that naturally contain beneficial compounds. Examples include:

• Blueberries

• Salmon

• Avocados

• Green tea

• Yogurt

• Nuts

• Cruciferous vegetables

Fortified or enhanced functional foods

These foods have beneficial nutrients added to them, such as:

• Vitamin D-fortified milk

• Calcium-fortified plant milks

• Probiotic-enriched foods

• Certain fortified cereals

For many health-conscious consumers, the emphasis is on obtaining functional benefits from minimally processed, nutrient-dense whole foods whenever possible.

Best functional foods

Many whole foods contain compounds that support health in unique ways. Rather than focusing on a single "superfood," it's helpful to build a diverse diet rich in a variety of functional foods.

1. Berries

Blueberries, strawberries, raspberries and blackberries are among the most researched functional foods. They contain anthocyanins and other polyphenol antioxidants that help protect cells from oxidative stress.

Berries also provide vitamin C, fiber and plant compounds associated with healthy aging and cardiovascular wellness. Their antioxidant content makes them one of the most nutrient-dense fruits available.

Berries are also naturally low in calories while providing significant amounts of fiber, which can help support digestive health and promote feelings of fullness. Their vibrant colors come from a variety of phytonutrients that have been studied for their potential roles in supporting healthy aging and overall cellular health.

Because they can be enjoyed fresh, frozen or dried, berries offer a convenient way to increase antioxidant intake throughout the year.

2. Fatty fish

Salmon, sardines, mackerel and anchovies are excellent sources of omega-3 fatty acids, particularly EPA and DHA.

Omega-3s are known for supporting heart, brain and eye health. For instance, research has linked higher omega-3 intake with cardiovascular benefits, making fatty fish one of the most widely recognized functional foods.

In addition to healthy fats, fatty fish provide high-quality protein and vitamin D.

Fatty fish also contain important nutrients, such as vitamin B12, iodine and selenium, all of which play essential roles in normal metabolism and overall health.

The combination of high-quality protein and healthy fats can help support satiety, making fatty fish a satisfying addition to meals.

Health organizations commonly recommend consuming fish regularly as part of a balanced eating pattern due to its nutrient density and well-established health benefits.

3. Fermented foods

Fermented foods, such as yogurt, kefir, sauerkraut, kimchi and certain fermented vegetables, contain beneficial microorganisms that may support the gut microbiome.

Because much of the immune system is closely connected to gut health, maintaining a diverse microbial environment is an important component of overall wellness. Probiotic-containing foods are among the most studied functional foods for digestive health.

Fermented foods can also improve flavor complexity and may enhance the bioavailability of certain nutrients.

In addition to probiotics, many fermented foods provide vitamins, minerals and beneficial compounds created during the fermentation process. Depending on the food, fermentation may also help improve digestibility and enhance the availability of certain nutrients.

Including a variety of fermented foods in the diet can help diversify sources of beneficial microbes while adding unique flavors and textures to meals.

4. Leafy green vegetables

Spinach, kale, arugula and Swiss chard provide vitamins, minerals, carotenoids and phytonutrients that support overall health.

These vegetables are particularly rich in vitamins A, C and K, along with compounds such as lutein and zeaxanthin that help support eye health.

Leafy greens are also excellent sources of folate, a B vitamin involved in healthy cell growth and function. Many varieties provide magnesium, potassium and calcium, which support numerous physiological processes throughout the body.

Because they are so nutrient-dense relative to their calorie content, leafy greens are often considered foundational foods in many healthy dietary patterns.

5. Cruciferous vegetables

Broccoli, Brussels sprouts, cauliflower, cabbage and bok choy contain glucosinolates and sulfur-containing compounds that have attracted significant scientific interest. These vegetables also contribute substantial amounts of fiber, which helps support digestive health and gut microbial diversity.

Cruciferous vegetables also provide vitamin C and a variety of antioxidants. Their unique phytochemical profile makes them a standout category among functional foods, while their versatility makes them easy to incorporate into soups, salads, stir-fries and roasted vegetable dishes.

6. Nuts

Almonds, walnuts, pistachios and pecans offer a combination of healthy fats, fiber, plant protein and antioxidants. Regular nut consumption has been associated with cardiovascular and metabolic health benefits, making nuts an excellent functional snack.

Different nuts provide unique nutritional advantages. For example, almonds are rich in vitamin E, pistachios contain beneficial carotenoids and walnuts provide plant-based omega-3 fatty acids.

The combination of healthy fats, fiber and protein can help make nuts a satisfying snack while contributing valuable nutrients to the diet. They can also be easily incorporated into breakfast dishes, salads and homemade trail mixes.

7. Avocados

Avocados provide monounsaturated fats, fiber, potassium and carotenoids.

Their healthy fat content can help support nutrient absorption while contributing to satiety. They also contain compounds that support heart health and metabolic wellness.

Avocados are particularly rich in potassium, a mineral that helps support fluid balance, nerve signaling and normal muscle function. Their monounsaturated fats are similar to those found in olive oil and are commonly associated with heart-healthy dietary patterns.

Additionally, consuming avocados alongside vegetables may help increase the absorption of certain fat-soluble nutrients and antioxidants.

8. Green tea

Green tea is rich in catechins, a class of polyphenol antioxidants that have been widely studied for their health-promoting properties.

As a functional beverage, green tea provides hydration while delivering bioactive compounds that may help support healthy aging and overall wellness.

One of the most notable compounds in green tea is epigallocatechin gallate (EGCG), a catechin that has been widely studied for its antioxidant properties. Green tea also naturally contains L-theanine, an amino acid that may help promote a calm yet focused state when consumed as part of a healthy lifestyle.

Together, these compounds contribute to green tea's reputation as one of the world's most popular functional beverages.

9. Extra virgin olive oil

A cornerstone of the Mediterranean diet, extra virgin olive oil contains monounsaturated fats and powerful polyphenol antioxidants.

Its unique combination of healthy fats and plant compounds has made it one of the most extensively researched functional foods for cardiovascular health and healthy aging.

Extra virgin olive oil differs from more refined oils because it retains naturally occurring polyphenols and other bioactive compounds. These compounds contribute not only to its flavor profile, but also to its antioxidant activity.

Extra virgin olive oil is frequently included in dietary patterns associated with sustained health and wellness.

10. Beans and legumes

Black beans, lentils, chickpeas and other legumes provide fiber, plant protein, resistant starch and polyphenols. These nutrients help support digestive health, satiety and healthy blood sugar management while contributing to overall nutrient intake.

Beans and legumes are also excellent sources of resistant starch, a type of carbohydrate that can act as a prebiotic and help nourish beneficial gut bacteria. Their combination of fiber and plant protein can help support satiety and balanced eating habits.

In addition, legumes provide important nutrients such as magnesium, iron and potassium, making them one of the most affordable nutrient-dense foods available.

11. Tomatoes

Tomatoes are rich in lycopene, a carotenoid antioxidant that gives them their red color. Lycopene has been studied extensively for its antioxidant activity, making tomatoes one of the most recognized examples of a functional food.

In addition, tomatoes provide vitamin C, potassium and several additional carotenoids beyond lycopene.

Interestingly, lycopene becomes more bioavailable when tomatoes are cooked, making foods such as tomato sauce, tomato paste and soups concentrated dietary sources. Their versatility and nutrient profile make tomatoes an easy functional food to incorporate into everyday meals.

12. Turmeric

Turmeric contains curcumin, a bioactive compound known for its antioxidant properties. Curcumin has been extensively studied for its antioxidant activity and its ability to support healthy inflammatory responses already within the normal range.

Used for centuries in traditional wellness practices, turmeric has become one of the most popular functional foods due to its unique phytochemical profile.

Potential benefits

The benefits of functional foods depend on the specific compounds they contain and how they fit into an individual's overall dietary pattern. No single food can prevent disease or guarantee health outcomes, but research suggests that diets rich in functional foods may support multiple aspects of wellness.

1. Help support heart health

Many functional foods contain nutrients associated with cardiovascular wellness, including:

• Omega-3 fatty acids

• Soluble fiber

• Polyphenols

• Monounsaturated fats

Foods such as fatty fish, olive oil, nuts and legumes are commonly included in heart-healthy dietary patterns.

2. May promote healthy gut function

Functional foods that contain probiotics, prebiotics and dietary fiber may help support a balanced gut microbiome.

A healthy microbiome plays a role in digestion, nutrient absorption and immune system function. Fermented foods, fiber-rich vegetables and legumes are especially beneficial in this area.

3. May provide antioxidant benefits

Many functional foods are rich in antioxidants that help neutralize free radicals and support cellular health.

Berries, green tea, tomatoes, leafy greens and colorful vegetables are particularly rich sources of antioxidant compounds.

4. Support healthy aging

Research suggests that dietary patterns emphasizing nutrient-dense, antioxidant-rich foods may help support healthy aging.

Foods rich in polyphenols, healthy fats and vitamins contribute to overall wellness and may help maintain normal physiological function as people age. That makes them some of the best foods for healthy aging.

5. May aid immune system health

Many functional foods provide nutrients involved in normal immune function, including:

• Vitamin C

• Vitamin D

• Zinc

• Polyphenols

• Beneficial microbes

A diverse, nutrient-rich diet helps ensure the body has access to the nutrients needed for healthy immune system function.

6. Help with metabolic wellness

Fiber-rich foods, legumes, vegetables and healthy-fat-containing foods may support healthy blood sugar balance and satiety when consumed as part of a balanced diet.

These foods often promote greater nutrient density while helping reduce reliance on heavily processed foods.

Conclusion

Functional foods are foods that provide benefits beyond basic nutrition due to naturally occurring or added bioactive compounds. While no single food is a cure-all, incorporating a variety of functional foods into your daily routine can help support overall wellness.

Some of the best functional foods include berries, fatty fish, fermented foods, leafy greens, cruciferous vegetables, nuts, avocados, green tea, olive oil, legumes, tomatoes and turmeric. Together, these foods provide antioxidants, fiber, healthy fats, probiotics and other compounds that may support heart health, digestive function, immune system health and healthy aging.

Rather than searching for one miracle ingredient, focus on building a diverse, nutrient-dense diet rich in whole-food functional ingredients. Over time, those daily choices can add up to meaningful sustained health benefits.