Thursday, September 18, 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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Broccoli may protect against colorectal cancer

Published 15 September 2025
– By Editorial Staff
Delicious on the plate and delicious for your health.
2 minute read

People who eat more broccoli and cauliflower have a lower risk of colorectal cancer, according to a Chinese study. However, moderate amounts are sufficient to achieve the protective effect.

Colorectal cancer is the third most common form of cancer worldwide and is also the second leading cause of cancer-related deaths.

In Sweden, colorectal cancer has increased among young people over the past thirty years, and mortality from this form of cancer has increased among patients in all age groups for up to ten years after cancer diagnosis.

In the study, which was published in BMC Gastroenterology, researchers analyzed data from 17 previous studies, with a total of 639,539 participants, including 97,595 cases of colorectal cancer.

The purpose was to investigate whether higher vegetable intake corresponded to greater risk reduction for this form of cancer and, if so, the specific amounts at which this effect became significant.

The results showed that those who ate more cruciferous vegetables, such as broccoli, cabbage, cauliflower, or Brussels sprouts, had a 20 percent lower risk of colorectal cancer compared to those who ate less.

Photo: Polina Tankilevitch/Pexels

Glucosinolates

These vegetables contain many beneficial substances such as vitamins, fiber, and antioxidants. But what makes them extra special are compounds called glucosinolates. When you chew these vegetables, glucosinolates break down into other compounds called isothiocyanates – particularly one called sulforaphane.

These are the compounds that give the vegetables their strong, sometimes slightly bitter taste and smell. These are also the compounds believed to be cancer-preventive.

The researchers found that the greatest risk reduction was observed between 20 and 40 grams, but no significant improvement was seen above 40 grams per day.

The study was conducted at the Second Clinical Medical School of Inner Mongolia University for the Nationalities in Yakeshi, China.

Thousands of Swedes unaware of their high blood pressure

Published 14 September 2025
– By Editorial Staff
Nine out of ten Swedes are expected to be affected by hypertension at some point during their lifetime.
2 minute read

Every other person with high blood pressure lacks knowledge of their diagnosis. Therefore, new national guidelines are now being developed.

High blood pressure, or hypertension, is very common and it is estimated that nine out of ten Swedes will be affected by it at some point during their lifetime. Having high blood pressure means a higher risk of heart attack and stroke, among other conditions.

Today, approximately three million Swedes are estimated to suffer from it, but half don’t know about it. Women run a higher risk of being affected by cardiovascular diseases linked to lower blood pressure levels compared to men, yet despite this, 40 percent of women aged 35 to 49 are unaware of their blood pressure values, according to a report from the Swedish Heart-Lung Association earlier this year.

One in three Swedes don’t know their values, something that Mattias Brunström, associate professor of epidemiology at Umeå University in northern Sweden and chairman of the national working group for hypertension, believes needs to change.

If we could catch more people, we would avoid 30,000 cases of heart attack, stroke and heart failure in Sweden annually, he tells TT.

New guidelines

New guidelines will be presented in Sweden during the autumn. Today, the so-called blood pressure target is 140/90 mmHg (millimeters of mercury), but will be lowered to 130/80.

It’s important to clarify that we’re not changing the threshold for what constitutes high blood pressure. What’s changing is that blood pressure should be treated to lower levels than today, says Brunström, who has been involved in developing the new guidelines.

Furthermore, doctors will also be recommended to prescribe two medications directly to be able to lower blood pressure faster.

High blood pressure rarely has any symptoms, which is why many people walk around with it without knowing about it. However, one can experience symptoms such as headaches and fatigue, but the only way to be sure is to regularly check your blood pressure.

The Swedish Heart-Lung Association recommends that people under 40 check their blood pressure at least every three years, and thereafter should do so annually.

Through regular check-ups, one can detect early the need for support for lifestyle changes, medical treatment, or both, says Anders Åkesson, chairman of the Swedish Heart-Lung Association, in a press release.

Study: Ultra-processed food impacts men’s reproductive ability

Published 13 September 2025
– By Editorial Staff
In just three weeks, the health of young Danish men deteriorated markedly, a new study shows.
2 minute read

Just three weeks of ultra-processed food is enough to worsen young men’s sperm quality and testosterone levels, shows a new study from the University of Copenhagen. The men also gained weight compared to when they ate regular food – despite identical calorie intake.

Ultra-processed food is, in short, food that is industrially manufactured and contains a range of different ingredients, and is often a large part of especially Western diets today. Everything from bread, cereals, protein powder to candy, chips and ready meals can be classified as ultra-processed food. Previous studies have linked ultra-processed food to cardiovascular disease, depression, weight gain as well as nutritional deficiency.

Three weeks is enough

In the study, which was published in Cell Metabolism, 43 Danish men between 25 and 30 years old participated. First, the men ate only ultra-processed food for three weeks, then followed three weeks with minimally processed food. Both diets contained the same amount of carbohydrates, protein, fat and calories – the only difference was the degree of processing. Some of the men received a calorie intake adapted to their weight, while others received a surplus of about 500 calories. Between the two diets, the men had a 12-week break where they ate their usual diet.

The results show clear health deteriorations after the period with ultra-processed food, compared to when they ate less processed food. The men gained about one kilogram in body fat and their cardiovascular health deteriorated – regardless of which calorie intake they had. Additionally, the men had worse sperm quality and their testosterone levels dropped.

We are shocked by the results, says one of the researchers behind the study, Romain Barrés, professor at the University of Copenhagen at the Novo Nordisk Foundation Center for Basic Metabolic Research to forskning.no and continues:

It’s really alarming to think about what happens if you eat such food year after year. The consequences can be serious and chronic.

The study supports previous research that points to ultra-processed food potentially being harmful to health, but also strengthens the hypothesis that this type of food contains calories that are more fat-forming compared to home-cooked food. The researchers now hope that the study will influence politicians when they make decisions about diet and health for Danes.

These products, which harm our health, are everywhere in our supermarkets, says Barrés.

Study: More health problems at higher radiation levels

Published 12 September 2025
– By Editorial Staff
The most common symptoms were fatigue, headaches, increased irritability, sleep problems and anxiety.
2 minute read

People exposed to higher levels of microwave radiation report more health symptoms, shows a new Indian study. The correlation was particularly clear for fatigue, headaches and sleep problems.

The study, which was published in Electromagnetic Biology and Medicine, examined 183 people between 18 and 80 years old who had lived in the same home for at least one year in the city of Shillong in northeastern India. Researchers from Mizoram University in India measured microwave radiation in each residence and then divided participants into three groups based on the measured values.

The first group had the lowest levels (0–3,000 μW/m²) and included 43 participants. The second group had medium levels (3,000–5,000 μW/m²) with 49 participants, while the third and largest group had the highest levels (5,000–8,000 μW/m²) with 91 participants.

All participants answered a questionnaire about over 20 different symptoms.

The results showed that people in the highest exposure group reported significantly more health problems than the other groups. Even the medium group reported more symptoms than the lowest group. The researchers also discovered that people under 40 years old reported more inflammation-related symptoms.

Clearer symptoms among heavy phone users

The most common symptoms in the most exposed group were fatigue, headaches, increased irritability, sleep problems and anxiety. The symptoms were also more pronounced among people who used mobile phones more than five hours per day or lived within 50 meters of a base station.

To put the results in perspective: the Swedish reference value from the Swedish Radiation Safety Authority is 10 million μW/m², which means that all levels in the study were at least 1,250 times below this value.

The researchers concluded that exposure level was the only factor that affected the number of symptoms for all four examined health categories. The study confirms previous research that has linked health effects to radiation from mobile base stations. According to the Swedish Radiation Protection Foundation, fatigue, headaches and sleep problems are particularly common symptoms among people who live near 5G towers.

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