Sunday, September 7, 2025

Polaris of Enlightenment

Why you should have plants in your home

Published 13 October 2024
– By Editorial Staff
6 minute read

The right plants can significantly reduce harmful air pollutants. Additionally, their presence has been linked to lower stress levels and increased productivity.

The biophilia hypothesis proposes that humans have an inherent connection to nature, and as a result, experience comfort and well-being when immersed in it. A number of studies also show that spending time in nature can have major health benefits for us. For example, being close to nature at home tends to reduce the use of antidepressants and boost self-esteem. Studies also show that spending time in nature can positively change people’s perspective on time.

At the same time, there is also comfort for those who have difficulty getting to the forest. Studies suggest that even houseplants at home or work can have similar effects.

All plants produce oxygen and also absorb carbon dioxide. Some plants can also help purify the air and even improve humidity levels. As early as 1989, NASA was researching the effect of plants on the air in enclosed spaces as spacecraft are unable to ventilate away harmful substances. The study mainly used plants that do better in low-light environments, focusing on how plants can purify the toxic substances benzene, trichloroethylene and formaldehyde. The NASA study found that a lot of houseplants actually removed toxic substances from the air, at least partially.

Reducing stress

In a 2015 study, researchers wanted to look at the possible psychological and physiological health benefits of indoor plants. In this study, 24 young male participants were asked to either replant a houseplant or complete a brief computer-based task, after which their heart rate and blood pressure were measured. Participants who worked with the plants showed lower blood pressure and generally felt calmer compared to those who performed the computer task. In contrast, those who used the computer reported feeling more discomfort, and their blood pressure increased.

Even just looking at pictures of houseplants can have health benefits, according to another 2012 study. It exposed patients in a hospital waiting room to real plants, pictures of plants or no nature at all and compared the results. Both the real plants and the pictures of plants contributed to lower stress levels compared to having no nature at all in the waiting room.

Research also shows that houseplants can help people heal from injury or illness. An umbrella study found that hospitalized patients with a view of houseplants or trees were calmer and had better conditions for well-being compared to those without. They also typically required less pain medication and had shorter hospital stays than other patients.

Plants create happiness

Some research also suggests that houseplants can simply make you happier. For example, a 2013 study found that participants who spent five to ten minutes in a room with a few houseplants felt happier than those who were in a room without plants. Plants, or rather nature, are also generally thought to increase self-esteem and yet another study suggests that there is a very strong link between being close to nature and feeling happy.

Another study, published in 2019, found that green and purple plants in particular were effective in counteracting negative emotions.

Increases productivity

In a Korean study, primary school students were placed in classrooms with either a fake plant, a real plant, a photo of a plant, or no plant at all. Brain scans revealed that only the children exposed to a real plant showed significant improvements in attention and concentration. Similarly, a study from the Netherlands found that children in classrooms with a green plant wall performed better on tests of selective attention, which involves focusing on a specific task while filtering out distractions.

An older study from 1996 tried to implement potted plants in a windowless laboratory at a university. They found that, on average, students worked 12% faster if they had plants in the lab, compared to without. In another study, those working in a call center with a view of potted plants took 7% more calls compared to those without a plant view. Another study also tested implementing plants in three different offices in the UK and the Netherlands and found that those who had access to plants at their workplace were on average 15% more productive.

Air purifying plants

There are many plants that are claimed to purify the air of toxins, but some stand out in studies for their properties. If you’re in the market for a new houseplant but don’t know what to get, here are a few plants to consider.

Peace Lily (Spathiphyllum wallisii)

This plant is very common as a houseplant and should be easy to care for. It does not thrive in direct sunlight, but light, partial shade and even shade should be fine. It needs plenty of water and during the spring to fall you can also give nutrition once a month, but skip it during the winter.

Peace lilies are said to be one of the most air-purifying plants to have indoors. The NASA study found that it could reduce the toxic substance benzene by as much as 79.5% in just 24 hours. In the case of trichloroethylene, it reduced it by 23%, the highest reduction of any plant tested. It also removed 16,167 micrograms of formaldehyde in one day.

A 2022 study by researchers at the University of Birmingham tested three common houseplants, including the Peace Lily, to see if they could help remove air pollution in the home. All three plants were found to be effective against air pollution, removing around half of the nitrogen dioxide they were exposed to – in just one hour.

The Peace Lily is also said to be an effective humidifier as the leaves emit water vapor.

Peace Lily. Montage. Photo: Outi Marjaana, Elena Golovchenko/Pexels

Corn Plant (Dracaena fragrans)

Corn Plant is considered a shrub, or small tree. It thrives in semi-shade or shade and doesn’t need too much water, but the soil should be kept slightly moist. During winter it needs light, but does not like direct sunlight. Nutrition can be given once a month during winter

This plant was also included in the 2022 study, and is thus effective against air pollution, just like the Peace Lily. The NASA study also found that the plant was effective against formaldehyde

Corn Plant. Photo: feey/Unsplash

Ivy (Hedera helix)

The ivy does not like strong sunlight and likes to have a shower of water from time to time.

The leaves of the plant have long been used as a medicine for respiratory inflammations and are supposed to be expectorant. Today it is used as an active ingredient in medicines.

Ivy was also included in NASA’s study and proved to be the best of all plants at reducing benzene levels, by as much as 89.8% over 24 hours. In the case of trichloroethylene, it removed 10.9% over the same time. When eliminating formaldehyde, the plant reduced it by 9 653 micrograms over 24 hours.

Ivy. Photo: Jaunathan Gagnon/Unsplash

ZZ Plant (Zamioculcas zamiifolia)

ZZ Plant, also known as Eternity Plant, is hardy and can grow in both light and shade, but should not be placed in full sun. It will grow faster in a brighter position and the leaves will turn darker in a darker position. It’s good to allow the soil to dry out between waterings.

A 2013 study showed that the plant can effectively remove harmful substances such as benzene, toluene, ethylbenzene and xylenes (BTEX) from indoor environments. In another 2020 study, the plant was found to be particularly good at reducing concentrations of ethylbenzene. The researchers also saw positive effects when combined with other plants such as Sansevieria trifasciata to improve air purification of toluene and formaldehyde, among others.

This plant was also included in the previous study from 2022, and is thus effective against air pollutants.

ZZ Plant. Montage. Photo: WeFt, feey/CC BY-SA 3.0

True Aloe (Aloe vera)

Aloe vera thrives in well-drained soil, so it’s a good idea to put Leca balls in the bottom of the pot. It likes plenty of sun, but not too much water. Watering about twice a month is usually enough. Aloe vera is known for its many healing and health-giving properties, both internally and externally, but it is also said to be an excellent helper in purifying the air in the home.

True Aloe. Photo: Cecília O. Tommasini/Pexels

Two different review studies show that Aloe vera is effective in removing formaldehyde and benzene, but also xylenes. The plant was also included in the NASA study, which found that it could remove 1,555 micrograms of formaldehyde over 24 hours.

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Memory problems increase among Nordic children

Published 27 August 2025
– By Editorial Staff
Memory-related medical visits have tripled in a short time among children aged 5-14 in Sweden.
2 minute read

More children and young people are seeking medical care for memory problems in both Sweden and Norway. The Swedish Radiation Protection Foundation believes the increase may be linked to radiation exposure, which has also increased during the same period.

In Norway, there has been an increase in recent years in the number of people seeking medical care for memory problems, not only among adults but also among children. Between 2019 and 2024, for example, the number of doctor visits related to memory problems more than doubled, from 41,722 doctor visits to 98,910 doctor visits in 2024. Among children aged 5-14, visits had nearly tripled.

I have never seen such a dramatic increase in these figures before, says Richard Aubrey White, researcher and statistician at the Norwegian Institute of Public Health (FHI), to Norwegian state broadcaster NRK.

In Sweden too, the number of doctor visits regarding memory problems has increased, both among children and adults. Memory problems, which can be classified as mild cognitive impairment, is a diagnosis found under diagnostic code R41. In 2011, 577 children were registered with diagnosis R41 as the primary diagnosis; by 2024, the number had increased to 5,975.

Microwave radiation

The Swedish Radiation Protection Foundation believes the increase may be due to increased exposure to microwave radiation among people, pointing out that repeated research has shown, for example, that radiation has a harmful effect on memory.

Repeated scientific studies have also shown that people exposed to elevated levels of this radiation have an increased occurrence of various symptoms, called microwave syndrome, where impaired memory is one of the most common symptoms“, writes the Swedish Radiation Protection Foundation.

Cell towers associated with worse memory

Even in case studies examining the health effects of 5G, impaired memory tends to be one of the most commonly reported effects. Reports of impaired memory, concentration difficulties, and headaches are also common when living near cell towers.

The Swedish Radiation Protection Foundation notes that radiation has increased dramatically during the same period as the increase in doctor visits for memory problems has occurred. At the same time, mobile phones have begun to be used more extensively by both children and adults during the same period.

The increased memory problems, both among children and adults, are thus an expected effect resulting from the increase in people’s exposure to microwave radiation”.

Colorectal cancer affects more young Swedes

Published 23 August 2025
– By Editorial Staff
The study also shows that mortality has increased among both younger and older patients for up to ten years after cancer diagnosis.
2 minute read

Colorectal cancer is increasing among young people in Sweden, according to research from the Karolinska Institute. Researchers suggest that lifestyle factors, such as sedentary behavior and obesity, may be the cause.

In the study, which was published in Annals of Oncology, researchers examined over 135,000 Swedish patients who had colorectal cancer between 1993 and 2019.

The results show that the number of younger people under 50 who develop this form of cancer has increased over the past three decades. For rectal cancer, the number of new cases among younger people has increased by 2.04 percent per year, and for left-sided and right-sided colon cancer, the increase is 2.41 and 2.64 percent per year respectively. Overall, the disease has become two to three times more common among younger people.

Detected later in younger patients

Younger patients also more often had metastatic cancer compared to older patients, suggesting they had lived with symptoms longer before the cancer was discovered. Researchers emphasize that it’s important for both the public and healthcare professionals to know that this type of cancer can also affect younger people. This is particularly important since the chance of curing cancer increases with early detection.

The study also shows that mortality has increased among both younger and older patients up to ten years after cancer diagnosis.

This is remarkable, since patients are often considered cured after such a long time. Our results challenge that view and underscore the need for more research into why this is happening, as well as long-term follow-up and support for both young and older patients, says Cecilia Radkiewicz, researcher at the Department of Molecular Medicine and Surgery at the Karolinska Institute in Stockholm.

Lifestyle may be the cause

It’s unclear what actually lies behind the increase in colorectal cancer among young people, but researchers believe it doesn’t appear to be driven by traditional risk factors such as inflammatory bowel disease or heredity. Instead, the results suggest that lifestyle factors may be decisive.

Childhood obesity, sedentary lifestyle, and antibiotic use have been highlighted as contributing factors, although the underlying biological mechanisms remain unclear, says Radkiewicz.

Just a few puffs are enough – how quickly vaping damages the lungs

Published 21 August 2025
– By Editorial Staff
Researchers have for the first time been able to demonstrate a direct link between inhaled nicotine from e-cigarettes and inflammatory markers in the blood.
2 minute read

Just a few puffs of an e-cigarette, or vape, containing nicotine can trigger inflammation in the lungs, according to research from Uppsala University in Sweden.

The researchers, who received funding from the Swedish Heart-Lung Foundation, tested 22 healthy individuals on two different occasions. The participants then smoked e-cigarettes both with and without nicotine for half an hour each.

When the researchers analyzed the blood samples, they found that participants exposed to nicotine-containing e-cigarettes showed elevated levels of inflammatory markers in their blood. According to the researchers, this could mean that just a few inhalations are enough to trigger an inflammatory reaction in lung tissue.

The results are alarming, as they clearly show that e-cigarettes with nicotine are not a harmless alternative to cigarettes. We have long worked to spread scientifically-based knowledge about nicotine’s health effects, and this research strengthens our conviction that tobacco and new nicotine products should be treated equally under the law, says Kristina Sparreljung, Secretary General of the Swedish Heart-Lung Foundation, in a press release.

For the first time, researchers have been able to demonstrate a direct link between inhaled nicotine and specific inflammation markers in the blood that are connected to the lungs. The researchers believe the absorption rate is particularly concerning, as the body absorbs nicotine faster than with nicotine patches, for example.

Our results are in line with previous studies where nicotine from e-cigarettes has been shown to affect blood vessels by increasing levels of vascular damage markers in the blood. It’s remarkable that even single occasions can produce biological effects. In the long term, this could contribute to the development of both lung diseases and cardiovascular disease, says Fariborz Mobarrez, lecturer and researcher at the Department of Medical Sciences at Uppsala University.

Obesity the most common risk factor for heart attack among Swedes

Published 20 August 2025
– By Editorial Staff
Women who suffer heart attacks often have more risk factors and a worse prognosis than men.
2 minute read

Obesity has overtaken smoking as the primary cause of heart attack among young adults in Sweden, a new study shows.

In the study, which was published in European Heart Journal – Quality of Care and Clinical Outcomes, researchers followed 44,254 people aged 18–59 after they suffered their first heart attack. The study is a registry-based study and was conducted with support from the Swedish Heart-Lung Foundation.

The results show that three out of four young adults who suffered a heart attack had at least one known risk factor – most commonly high blood pressure, diabetes, smoking, or obesity. Furthermore, the study shows that obesity has overtaken smoking as the most common risk factor in this age group. The reason is that the number of smokers has decreased, but at the same time the proportion suffering from obesity has increased markedly. For example, one in four suffered from obesity in 2006, and more than one in three in 2021.

It is concerning that the proportion of people with obesity has overtaken the proportion of smokers as the most common risk factor among young adults. But it also shows that we can do much to prevent heart attacks by finding and treating risk factors in time, says Moa Simonsson, researcher and senior physician in cardiology at Karolinska University Hospital in Stockholm, in a press release.

Difference between men and women

Men run a greater risk of suffering a heart attack compared to women and are often affected earlier in life. At the same time, the study shows that women who suffer heart attacks often have more risk factors, but also that they have a worse prognosis after a heart attack.

It seems that women who have a heart attack need to have a heavier burden of risk factors than men to be affected. This shows that we need to understand more about women’s particular risks, such as complications during pregnancy, says Simonsson.

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