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Best Functional Foods for Specific Health Goals

By Edwina Clark, MS, RD, CSSD

August 31, 2026

In general, functional is a word that’s used more often these days. While it loosely relates to how something might work, it also means “designed for practical use.”

From functional exercises (multi-joint exercises that mimic daily movements) to functional supplements (supplement ingredients designed to deliver specific health benefits, such as a collagen powder with added ingredients for beauty benefits), everyone wants more functional in their life.

Enter functional foods. While the term ‘functional foods’ was first used in Japan in the 1980s (and their government even established a regulatory system for the labeling of “foods for specified health uses”), the definition is largely unregulated in the U.S. That’s partly why it’s so important to learn more about what constitutes a functional food and how these foods may be able to help you with your own health goals.

After all, with protein, fiber and more components added to foods than ever before, functional foods are definitely having a moment.

Learn the following below:

• What are functional foods?

• Why food marketers are leaning into functional foods

• The major benefits of functional foods

• The best examples of functional foods

• Specific functional foods for certain health goals

• Frequently asked questions

What are functional foods?

The strict definition of functional foods is industrially processed or natural whole foods that, when regularly consumed within a diverse diet at efficacious levels, have potentially positive effects on health beyond basic nutrition. Additionally, randomized, double-blind, placebo-controlled clinical trials are necessary to establish functional efficacy.

Types of functional foods:

• Conventional (whole) foods: Beneficial nutrients and compounds are naturally present in these unprocessed foods. E.g. fruits, vegetables, nuts, seeds, fatty fish and whole grains.

• Modified (fortified) foods: Food enriched or fortified with beneficial components. E.g. yogurt with added probiotics and fiber, milk with vitamin D, cereal with folate, juice with calcium.

Functional foods are more popular than ever in the food landscape, with manufacturers scrambling to add extra compounds like protein, probiotics, fiber, vitamins, minerals, etc. to supposedly improve the health of the consumer. While sometimes this may be the case, such as helping address a nutrient gap, it’s certainly not always true.

The FDA does regulate the health claims that can be published on the labels, but does not have a formal definition of functional foods. Moreover, companies get around this by making nutrient claims that suggest functionality without actually providing the implied benefits.

Benefits of functional foods

1. Fill nutrient gaps

Functional and fortified foods can help address common nutrient gaps by providing nutrients that may be lacking in a person’s usual diet. Fiber is a good example, as most Americans fall short of recommended fiber intake. Foods with added fiber can provide another convenient way to help increase daily intake.

Nutrient needs can also vary based on dietary patterns and life stage. People following plant-based diets, for example, need to pay particular attention to vitamin B12 because it is naturally found primarily in animal foods, making fortified foods or supplements important sources.

Iron is another nutrient to consider, particularly for women of childbearing age and those following plant-based diets. In these cases, appropriately fortified functional foods can help complement a nutrient-dense diet and fill potential nutritional gaps.

2. Support disease prevention

Functional foods may help support long-term health and disease prevention by providing nutrients and bioactive compounds that help maintain normal body functions. Foods rich in fiber, antioxidants, healthy fats, probiotics and plant compounds, for example, can support cardiovascular health, healthy blood sugar regulation, digestive health and a healthy inflammatory response.

When eaten regularly as part of an overall nutrient-dense diet, functional foods may also help address dietary risk factors associated with chronic diseases.

It’s important to view functional foods as part of the overall dietary pattern rather than as treatments for disease. Fruits, vegetables, whole grains, legumes, nuts, seeds, fermented foods and fatty fish can contribute protective nutrients and compounds, but no single functional food can prevent disease on its own.

3. Support health and performance goals

Functional foods can also play a role in supporting specific health, fitness and performance goals. Beyond providing basic nutrition, certain foods and nutrients can help support muscle growth and recovery, exercise performance, cardiovascular health and healthy aging.

For example, protein-rich foods provide essential amino acids needed to build and maintain muscle, making adequate protein especially important for active individuals and as people age.

Supplements can also provide concentrated amounts of certain functional nutrients as well. Protein supplements, such as whey protein, offer a convenient way to increase protein intake and support muscle protein synthesis, recovery and lean muscle mass.

Creatine can help increase the muscles’ stores of phosphocreatine, which is used to rapidly produce energy during high-intensity activity, helping support strength, power and exercise performance. Omega-3 supplements, particularly those providing EPA and DHA, can complement dietary sources such as fatty fish and help support cardiovascular health, brain health and a healthy inflammatory response.

These foods and supplements work best as part of a well-rounded diet rather than as replacements for nutritious whole foods. Of course, the most appropriate choices depend on a person’s diet, activity level and individual health and performance goals.

Best functional foods

While the best functional foods vary, depending on age, sex, health goals, activity levels and other factors, a Mediterranean-style diet is largely thought to be the gold standard for optimal health.

Here are some of the top functional foods to start eating more of:

1. Oats

Oats are a functional food because they provide beta-glucan soluble fiber, which supports heart health, healthy cholesterol levels, digestive health and more stable blood sugar levels.

2. Functional beverages

Functional beverages with added protein or functional mushrooms can provide targeted benefits beyond hydration — for example, protein drinks can support muscle maintenance and recovery.

Beverages containing certain functional mushrooms may provide bioactive compounds that support areas such as immune health, stress response or cognitive function, depending on the mushroom used.

3. Wild-caught salmon

Wild-caught salmon is a top functional food because it provides high-quality protein, omega-3 fatty acids (EPA and DHA), vitamin D and other nutrients that support heart and brain health, muscle function and a healthy inflammatory response.

4. Leafy greens

Leafy greens provide fiber, folate, vitamins A, C and K, minerals and antioxidant plant compounds that support heart, bone, digestive and overall health.

5. Berries

Berries are rich in fiber, vitamin C and antioxidant polyphenols such as anthocyanins, which can support heart, metabolic and brain health while helping protect cells against oxidative stress.

6. Yogurt and kefir

Yogurt and kefir are functional foods because they provide protein, calcium and, when they contain live and active cultures, beneficial microbes that can support digestive health, gut microbial balance and bone health.

7. Olive oil

Extra virgin olive oil provides heart-healthy monounsaturated fats and antioxidant polyphenols that support cardiovascular and metabolic health and a healthy inflammatory response.

8. Whole grains

Whole grains provide fiber, B vitamins, minerals and beneficial plant compounds that support digestive, heart and metabolic health while helping promote healthy blood sugar levels.

For example, whole grain cereals with less than 8 grams of added sugar per serving and at least 3 grams of fiber per serving are far better than those that don’t meet that threshold.

9. Nuts and seeds

Nuts and seeds provide healthy fats, plant-based protein, fiber, vitamins, minerals and antioxidant plant compounds that support heart, metabolic and digestive health.

10. Beans and legumes

Beans and legumes provide plant-based protein, fiber, resistant starch, vitamins, minerals and beneficial plant compounds that support digestive, heart and metabolic health while promoting healthy blood sugar levels.

11. Eggs

Eggs provide high-quality protein, choline, B vitamins, selenium and carotenoids such as lutein and zeaxanthin, which support muscle, brain and eye health.

12. Functional supplements

Some functional supplements can provide concentrated or convenient sources of nutrients and bioactive compounds to support specific health and performance goals.

For example, protein bars and whey protein can support protein intake and muscle recovery, collagen can support the skin and joints, creatine can support strength and exercise performance, omega-3s can support heart and brain health, super greens can supplement intake of plant-based nutrients and compounds, and products with added probiotics can support digestive and gut health.

Specific functional foods for certain health goals

1. Gut health

For gut health, functional foods rich in fiber, prebiotics, probiotics, polyphenols and beneficial compounds from fermentation can help support healthy digestion and a balanced gut microbiome.

Fiber promotes regularity and provides fuel for beneficial gut microbes, while prebiotics specifically help nourish certain beneficial bacteria and support the production of compounds such as short-chain fatty acids.

Probiotics provide beneficial live microorganisms that can help support microbial balance and digestive health, while polyphenols interact with the gut microbiome and may support beneficial bacteria, the gut barrier and a healthy inflammatory response.

Fermented foods such as yogurt, kefir, kimchi and sauerkraut can also provide beneficial microbes and fermentation-derived compounds that help support overall gut health.

2. Brain health

For brain health, a nutrient-dense diet that includes adequate protein, vegetables, extra virgin olive oil, nuts, berries, whole grains, beans and legumes, and fatty fish can provide nutrients and bioactive compounds that help support healthy cognitive function as we age.

Berries are particularly rich in polyphenols, while fatty fish provide omega-3 fatty acids and extra virgin olive oil and nuts supply beneficial unsaturated fats and antioxidant compounds. Green tea may also offer brain-supporting plant compounds.

This combination closely resembles the MIND diet, an eating pattern that emphasizes leafy greens, berries, nuts, whole grains, beans, olive oil, fish and poultry and has been studied for its potential role in supporting cognitive health.

Other nutrients and compounds — including omega-3s, curcumin, B vitamins such as folate, vitamin D, probiotics, antioxidants and creatine — are also being studied for brain health, although evidence varies and the benefits of certain nutrients may depend on a person’s existing nutrient status.

3. Heart health

Functional foods such as fruits and vegetables, extra virgin olive oil, avocados, nuts, fatty fish, beans, legumes and whole grains provide fiber, healthy fats, antioxidants and other plant compounds that support cardiovascular function.

Oats, oat bran, beans and legumes are particularly good sources of soluble fiber, which can help maintain healthy cholesterol levels, while fatty fish provide omega-3 fatty acids that support healthy triglyceride levels and overall cardiovascular health.

Extra virgin olive oil, avocados and nuts provide heart-healthy unsaturated fats that can be used in place of foods high in saturated fat. Garlic, tea and cocoa-rich dark chocolate also contain beneficial plant compounds that may support healthy blood pressure, circulation and blood vessel function.

Overall, emphasizing these nutrient-dense foods while limiting excess saturated fat can help support healthy cholesterol levels and long-term heart health.

4. Weight management

Functional foods that provide protein, fiber, healthy fats and beneficial plant compounds can help support satiety, metabolic health and a healthy body composition.

Fiber-rich foods help promote fullness and can make it easier to manage overall food intake, while lean protein supports satiety and helps maintain lean muscle mass, particularly during weight loss.

Berries and pomegranate provide fiber and polyphenols, while green tea contains catechins and caffeine that may modestly support energy expenditure and fat metabolism. Nuts, extra virgin olive oil and avocados provide satisfying unsaturated fats that can support metabolic health when incorporated into a balanced diet.

Prebiotic foods nourish beneficial gut bacteria, while probiotic foods and supplements can help support a healthy gut microbiome, which is increasingly being studied for its relationship with metabolism and body weight.

Ultimately, these foods work best as part of an overall nutrient-dense eating pattern that supports an appropriate calorie intake, regular physical activity and other healthy lifestyle habits.

4. Pre-menopausal health

For premenopausal women’s health, a Mediterranean-style eating pattern rich in vegetables, fruits, whole grains, legumes, nuts, seeds, fish and extra virgin olive oil can provide nutrients and beneficial plant compounds that support cardiovascular, metabolic and reproductive health.

Certain nutrients deserve particular attention during the reproductive years: folate and vitamin B12 support healthy red blood cell formation and normal cellular processes, while iron helps replace losses associated with menstruation and supports healthy energy levels.

Calcium and vitamin D are important for building and maintaining strong bones, and DHA, an omega-3 fatty acid found primarily in fatty fish, supports brain, heart and reproductive health.

Emphasizing a varied, nutrient-dense diet can help women meet these needs while supporting overall health before menopause.

5. Post-menopausal health

A Mediterranean-style eating pattern rich in vegetables, fruits, whole grains, legumes, nuts, seeds, fish and extra virgin olive oil can help support cardiovascular, metabolic and overall health as women age.

Adequate protein becomes particularly important for maintaining muscle mass and strength, while fiber supports digestive health, healthy cholesterol and blood sugar levels. Omega-3 fatty acids, especially from fatty fish, support heart and brain health and a healthy inflammatory response.

Bone health is also a major focus after menopause: calcium, vitamin D, phosphorus and magnesium all contribute to maintaining healthy bones, while prunes have been studied for their potential to help support bone mineral density in postmenopausal women.

Soy foods provide protein and isoflavones, plant compounds that may offer additional benefits for bone and cardiovascular health. Collagen peptides may complement adequate protein and key bone-building nutrients by providing amino acids that support connective tissues, including bones and joints.

Together, these functional foods and nutrients can help support healthy bones, muscle mass, cardiovascular health and overall healthy aging after menopause.

6. Muscle recovery

For muscle recovery, functional foods and supplements can provide the nutrients needed to repair muscle tissue, replenish energy stores and support training adaptations. P

Protein, particularly leucine-rich sources such as whey and dairy, provides essential amino acids that stimulate muscle protein synthesis and help repair and rebuild muscle after exercise. Getting enough protein is important throughout life, but becomes increasingly important with age as maintaining and building muscle can become more difficult.

Carbohydrates help replenish muscle glycogen used during training, while antioxidant-rich foods and ingredients such as tart cherry juice and turmeric may support a healthy inflammatory response and recovery from exercise. Creatine helps replenish the rapid energy system used by muscles and can support strength, performance and gains in lean muscle when combined with resistance training.

Omega-3 fatty acids from fatty fish may support muscle function and a healthy inflammatory response, while probiotic foods and supplements may support gut health and nutrient utilization, with emerging research examining their role in exercise recovery.

Frequently asked questions

Are whole foods better than fortified functional foods?

It depends! Generally, eating a wide variety of nutrient-dense whole foods is the way to go; however, functional and fortified foods can help fill nutrient gaps and support health and wellness goals.

For example, many cereals are fortified with iron, the most common nutrient deficiency in the world. Iron is critical for normal growth and development in kids, and iron deficiency in the early years can have lifelong impacts.

Vitamin D is another good example. Vitamin D is widely underconsumed and adding it to milk helps people get closer to their needs.

Are all functional foods good for you?

Not necessarily. Functional foods encompass a broad range of products, and their overall nutritional quality can vary considerably. While some are naturally nutrient-dense or formulated with beneficial ingredients, others may contain significant amounts of added sugar, sodium or saturated fat.

For example, a protein bar might provide a substantial amount of protein but also be high in saturated fat depending on its ingredients. Rather than assuming a food is healthy simply because it offers a functional benefit, consider the entire nutrition profile, ingredient list and how the food fits into your overall diet.

What are the rules for a healthy functional food?

A healthy functional food should provide a meaningful nutritional or health benefit while maintaining a strong overall nutrition profile. Look for foods that provide beneficial nutrients or bioactive compounds —s uch as protein, fiber, healthy fats, vitamins, minerals, probiotics or polyphenols — in meaningful amounts, while limiting added sugars, excess sodium and saturated fat.

Functional ingredients should ideally have evidence supporting their benefits, rather than simply being included because they’re trendy. Most importantly, consider the food as a whole: A product containing one beneficial ingredient isn’t necessarily a healthy choice if the rest of its nutritional profile is poor.

Are functional foods the same as superfoods?

No. Functional foods are foods that provide benefits beyond basic nutrition because they contain nutrients or bioactive compounds such as fiber, probiotics, omega-3s or polyphenols. “Superfood” is an informal marketing term generally used to describe especially nutrient-dense foods, such as berries, leafy greens or salmon, and it has no standardized scientific or regulatory definition. Many foods described as superfoods can also be considered functional foods, but the terms aren’t interchangeable.

How often should you eat functional foods?

Functional foods can be eaten daily as part of a balanced, nutrient-dense diet, with an emphasis on variety rather than relying on any single food for a specific benefit. Foods such as fruits, vegetables, whole grains, nuts, seeds, legumes, fermented foods and fatty fish can be incorporated regularly based on individual nutritional needs and health goals, while fortified foods and functional supplements can be used when appropriate to complement — not replace — a healthy overall diet.

Edwina Clark, RD, is a registered dietitian, foodie and fitness-junkie on a mission to help others lead healthy and happy lives. Her clinical training experience includes weight management, diabetes, gut health, allergies and sports nutrition. Now based in Alexandria, Virginia, this proud Australian has over a decade of experience bringing evidence-based health and wellness products to market. Edwina is an Ancient Nutrition paid partner and part of Ancient Nutrition's Wellness Roundtable.

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