What are superfoods and why should you eat them?
The term “superfood” is a fairly new term referring to foods that offer maximum nutritional benefits for minimal calories. They are packed with vitamins, minerals, and antioxidants.
No standard criteria or legal definitions classify any food as a superfood at this time. However, most superfoods are plant-based.
In this article, we define what qualifies as a superfood, provide some common examples and their benefits, and provide tips on how to include them in the diet.
Superfoods are foods that have a very high nutritional density. This means that they provide a substantial amount of nutrients and very few calories.
They contain a high volume of minerals, vitamins, and antioxidants.
Antioxidants are natural molecules that occur in certain foods. They help neutralize free radicals in our bodies. Free radicals are natural byproducts of energy production that can wreak havoc on the body.
Antioxidant molecules decrease or reverse the effects of free radicals that have close links with the following health problems:
- heart disease
- cancer
- arthritis
- stroke
- respiratory diseases
- immune deficiency
- emphysema
- Parkinson’s disease
Superfoods are not cure-all foods. Dietitian Penny Kris-Etherton explains:
Studies have demonstratedTrusted Source that superfoods high in antioxidants and flavonoids help prevent coronary heart disease and cancer, as well as improving immunity and decreasing inflammation.
Regularly eating fruits and vegetables also has strong associations with a lower risk of many lifestyle-related health conditions and overall mortality.
The nutrients they contain help promote a healthy complexion, nails, and hair and increase energy levels.
They can also help maintain a healthy weight.
Berries
The higher levels of flavonoids in berries have been shown to lower the riskTrusted Source of a heart attack. A few commonly identified superfood berries include acai berries, blueberries, raspberries, tart cherries, cranberries, and goji berries.
They boast the following benefits:
- Acai berries: These are small, dark purple berries grown in South America. They contain 19 amino acids and many antioxidants.
- Blueberries: These are high in fiber, manganese, and vitamin K. Cranberries are high in a particular flavonoid that helps lower the risk of urinary tract infection.
- Goji berries: These are a small red berry native to Asia that are high in vitamin C and E, along with many different types of flavonoids. They are frequently used in Eastern medicine to help treat diabetes and high blood pressure and maintain eye, liver, and kidney health.
Soy
Soybeans have a high concentration of isoflavones, a type of phytochemical. Phytochemicals are compounds that occur naturally in plants.
Some research demonstrates that isoflavones in soy help reduce the amount of low-density lipoprotein (LDL) or “bad” cholesterol in the blood.
A few studies have shown that soy may prevent age-related memory loss. Soy isoflavones might also reduce bone loss and increase bone mineral density during menopause, as well as decreasing menopausal symptoms.
Tea
Tea contains few calories, helps with hydration, and is a good source of antioxidants.
Catechins, potent antioxidants found primarily in green tea, have beneficial anti-inflammatory and anti-carcinogenic properties.
A study published in the Journal of Physiological Anthropology examined the effects of green tea, white tea, and water consumption on stress levels in 18 students.
The study suggestedTrusted Source that both green and white tea had reduced stress levels and that white tea had an even greater effect. Larger studies are necessary to confirm this possible health benefit.
Green tea may also have an anti-arthritic effect by suppressing overall inflammation.
Leafy greens
People often identify kale, spinach, Swiss chard, beet greens, and collard greens as superfood leafy greens. These foods are rich in vitamins A, C, E, and K, and many B vitamins.
Leafy greens also contain an abundance of carotenoids, iron, magnesium, potassium, and calcium.
One cup of kale provides 550 micrograms (mcg) of vitamin K, equivalent to over 680 percent of a person’s daily needs. Kale and other leafy greens are high in fiber and water content, both of which help to prevent constipation and promote regularity and a healthy digestive tract.
Salmon
The high omega-3 fatty acid content in salmon and other fatty fish, such as trout and herring, can decrease the riskTrusted Source of abnormal heartbeats, reduce cholesterol and slow the growth of arterial plaque.
Dark chocolate
Research has foundTrusted Source that dark chocolate is high in flavonoids. Flavonoids demonstrateTrusted Source antioxidant activity, prevent coronary heart disease and certain types of cancer, and boost the immune system.
The component in chocolate specifically responsible for these benefits is cacao powder. Manufacturers derive this from cacao beans. Bear in mind that chocolate may have added ingredients, such as added sugar, that might negate these benefits.
Wine and grapes
Resveratrol, the polyphenol found in wine that made it famously “heart healthy”, is present in the skins of red grapes.
A few studies have shown promise that resveratrol can protect against diabetic neuropathy and retinopathy. These are conditions caused by poorly controlled diabetes where vision is severely affected.
One 2013 studyTrusted Source found that it reduced the effects of neural changes and damage associated with diabetic neuropathy.
Researchers have also found resveratrol to be beneficial for treating Alzheimer’s disease, relieving hot flashes and mood swings associated with menopause, and improving blood glucose control. However, large studies using human subjects are still needed to confirm these findings.
Another flavonoid that occurs in grapes, quercetin, is a natural anti-inflammatory that appears to reduce the risk of atherosclerosis and protect against the damage caused by LDL cholesterol in animal studies. Quercetin may also have effects that act against cancer.
However, more studies using human subjects are necessary before researchers can confirm the benefits beyond all doubt.
Although wine does contain antioxidants, keep in mind that eating grapes would provide the same benefit alongside additional fiber. The American Heart Association recommends that people limit alcoholic beverages Trusted Sourceto no more than two drinks per day for men and one drink per day for women.
