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Superfood


Superfood is a term that is commonly used to describe foods that offers multiple health benefits through its nutrient contents, beyond providing energy. Consumption of these foods is linked with disease prevention and improved quality of life.

The idea of superfoods offers longevity and vitality has long been described in various cultures. Recent findings on essential fatty acids, dietary fibers, essential micronutrients and antioxidants make them the main substances related to superfoods.

Superfood such as Omega-3 and Omega-6 fatty acids must be obtained in diet as the human body does not produce them naturally. Better known types of omega-3 fatty acids, Eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) are mainly associated with benefits for the heart. They reduce inflammation, improve blood flow, prevent formation of fat deposit in blood vessel, and reduce triglyceride levels. Consuming a diet enriched with EPA and DHA can lead to less frequent and milder headache in patients with migraine, while moderate intakes may also delay cognitive function decline in elderly men. Some studies suggest that dietary interventions combined with pharmacological treatments might have an additive benefit in prevention of such condition.

Micronutrients are vitamins and minerals which are consumed in small quantities but are nonetheless essential for physical and mental development. There is a long list of essential micronutrients, however the ones that are particularly deficient in diets include iron, zinc, calcium, iodine, vitamin A, B-vitamins, and vitamin C. Effects of these micronutrient deficiency includes night blindness, eyesight problems, anemia and stunted growth.

Some superfoods confer benefit to digestive health via dietary fibers. These includes soluble fibers (inulin) and non-digestible carbohydrates (oligosaccharides), better known as prebiotics that helps nourish microflora in the intestines. Insoluble fibers help with bowel movement, reduces risk of intestinal diseases and helps in weight control.

Phytochemicals found in plants provide their colors and characteristic smell. There are multiple different types of known phytochemicals which includes tannins, flavonoids, and saponins. These chemicals are produced by plants for their own benefit and do not have nutritional value for human. Yet, they have been found to provide multiple health benefits via antioxidant properties, hailed for preventing cancer, protecting cells from damage, and reducing signs of ageing.

Goji

One popular example of superfood would be the Goji berry, originating from China. Also known commonly as Wolfberry, they contain phytochemicals zeaxanthin dan carotene which are important in maintaining healthy eyesight. They can be taken as part of the diet, providing energy through complex sugar and protein contents. Carbohydrates betaine, cerebroside, beta-sitosterol in Goji berry help counter nerve damage in neurodegenerative diseases and protect the eyes from glaucoma –both are important especially in ageing populations.

Wholegrain

A lot of wholegrains have also been discussed to have superfood property. An analysis of more than 3000 middle- and older-aged American adults over years indicates taking more whole grains in diet may protect against heart disease. Person who ate at least 3 servings of whole grains daily had smaller increases in blood sugar levels, blood pressure, and waist size compared with persons who ate less than one-half serving per day.

An excellent example of super grain is Quinoa. It provides a rich supply of protein, dietary fibers, several B vitamins, dietary minerals, magnesium, phosphorus, and manganese. Quinoa seeds also have low glycemic index, it provides energy source in small, lasting amount, which makes it a good staple food item. Raw quinoa seeds provide polyphenols at a higher level compared to many fruits and vegetables. Polyphenols are known to have powerful anti-inflammatory benefits for the body, and it is believed that they could help to reduce the risk of some cancers, cardiovascular disease and other illnesses too. Indigestible carbohydrate fibres called oligosaccharides found in the grain act as prebiotic, they provide nutrients for intestinal microflora.

Pumpkin

Pumpkin, a fruit that is more nutritionally similar to vegetables, is a filling, nutrient-dense food with multiple health benefit. It’s very high in antioxidants, such as alpha-carotene, beta-carotene and beta-cryptoxanthin. These can neutralize free radicals, stopping them from damaging human cells. High content of vitamins A, C, and E, iron and folate help strengthen immunity. Pumpkins’ high vitamin A, lutein and zeaxanthin contents can protect the eyes against sight loss, which becomes more common with age. Pumpkin is also a good source of fiber and helps suppress appetite. It has mildly diuretic property, eating a lot of pumpkin may induce a “water pill”-like reaction, increasing the amount of water and salt the body expels through urine. This is particularly beneficial for people concerned with their blood pressure.

Beetroot

The beetroot is the taproot portion of a beet plant, one of several cultivated varieties of Beta vulgaris. Beetroot had been used as part of traditional remedy for multiple health benefits, particularly relating to blood and heart health. Studies have shown that beetroot juice can modestly help reduce blood pressure. Beetroot can be eaten raw, used for juice extraction, baked or boiled. Polyphenols and dietary fiber in red beetroot juice helps diminish blood cholesterol level by stimulating excretion of cholesterol in intestines. It has also been studied to stop weight gain and reduce cholesterol in obese individuals. Beetroot is rich in soluble dietary fiber that provide moderate increase in blood sugar level post-meal, and especially beneficial in pre-diabetic.  Regular consumption as part of diet also appears to positively influence physiological response to exercise. Therefore, beet root is an especially valuable super food for people concerned with their body weight and cardiovascular risks.

Although a lot of superfoods are from plant origin, fatty fishes are one of the exceptions. They provide essential proteins not commonly found in plants, which the human body use for energy production, growth, and repair. Fatty fishes found in cold water such as salmon, trout, and sardines contain higher level of omega-3 fatty acids compared to their warm-water counterparts. These benefits are however offset by risk of heavy metal contamination in larger fish. Thus, it is only recommended to take one to two servings of the fish weekly.

To get the best result from superfoods, is it best to consume them raw, cooked, or processed? The answer depends on which superfood one is referring to. In general, taking them as closely to their natural form is preferable to retain its nutrients. Juicing of beetroots, natural drying of goji berries, and removing the outermost shell of quinoa helps improve palatability and ease consumption. However, excessive consumption beyond dietary recommendation exposes to other risks. Red beet root, for example, accumulates oxalic acid responsible for causing kidney stones. Larger fatty fish may also have heavy metal content in their muscle tissue and may adversely affect some populations proportionately. In these cases, taking pre-processed food or supplements focusing on their benefit may be the wiser choice.

Most of the studies that display theoretical health benefits of these food products would use extracts in laboratory. In experimental studies, the method to gain the extract themselves are usually more vigorous than is possible in human digestive system. Therefore, a lot of the supporting studies may overestimate or underestimate the actual health benefit when we consume the food as part of our diet.

It is also important to note that phytochemical content may vary among species, cultivation method, and food handling prior to consumption. The magnitude of potential risks that may be associated with phytochemicals is still unclear, especially when taken in large doses as supplements. These extracted substances may have possible side effects or may interact with other substances in the body, e.g., medications. There are only few documented cases suggesting that certain phytochemicals may also be harmful. For instance, some studies have shown that overdosing on beta-carotene may increase the risk of lung cancer in smokers. Therefore, you should always speak to your healthcare provider before taking phytochemical supplements. Taking it as functional food in moderation is probably safer in the long run.

To quote the 2021 Dietary Guidance to Improve Cardiovascular Health scientific statement, developed under chair of the American Heart Association’s writing group, one can improve cardiovascular health and reduce cardiovascular risk with an emphasis on dietary patterns and food-based guidance beyond naming individual foods or nutrients. It is important to first emphasize on balanced diet, and to take superfoods strategically to enrich our nutrient consumption.

References

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